Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Well-Known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, At Carrying Value Cash and cash equivalents (including short term investments of $10,848 and $6,158, respectively) Cash and cash equivalents (including short term investments of $6,615 and $6,158, respectively) Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Available-For-Sale Securities, Current Securities available-for-sale Securities available-for-sale Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $44 and $45, respectively Accounts receivable, net of allowance for doubtful accounts of $45 and $45, respectively Prepaid and Refundable Income Taxes Prepaid and refundable income taxes Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer. It also includes carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Deferred Tax Assets, Net, Current Deferred income taxes Deferred Tax Assets, Net, Current, Total Deferred Tax Assets, Net, Current, Beginning Balance Deferred Tax Assets, Net, Current, Ending Balance Assets, Current Total current assets Total current assets Assets, Noncurrent [Abstract] Long term assets: Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Assets, Noncurrent Total long term assets Total long term assets Assets Total assets Total assets Liabilities and Equity [Abstract] Liabilities and Shareholders' Equity Liabilities, Current [Abstract] Current Liabilities: Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued liabilities Accounts payable and accrued liabilities Accrued Salaries, Current Accrued salaries Dividends Payable, Current Dividends payable Accrued Income Taxes, Current Accrued taxes on income Reserve For Settlement Expenses Including Fair Fund Reserve for settlement expenses Alternate concept name for the aggregate amount of Reserve for settlement expenses including fair fund as of the balance sheet date. Deferred Revenue, Current Unearned revenue Deferred Revenue, Current, Total Liabilities, Current Total current liabilities Total current liabilities Liabilities, Noncurrent [Abstract] Long term liabilities: Deferred Revenue, Noncurrent Unearned revenue Deferred Revenue, Noncurrent, Total Deferred Tax Liabilities, Noncurrent Deferred income taxes Liabilities, Noncurrent Total long term liabilities Total long term liabilities Liabilities Total liabilities Total liabilities Stockholders Equity Attributable To Parent [Abstract] Shareholders' Equity: Common Stock, Value, Issued Common stock, $0.10 par value; authorized 30,000,000 shares; issued 10,000,000 shares Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Additional Paid In Capital, Common Stock Additional paid-in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Retained Earnings (Accumulated Deficit) Retained earnings Retained earnings Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Treasury Stock, Value Treasury stock, at cost (103,619 shares on January 31, 2012 and 25,119 shares on April 30, 2011) Treasury Stock, Value, Beginning Balance Treasury Stock, Value, Ending Balance Treasury stock, at cost (103,619 shares and 25,119 shares, respectively) Accumulated Other Comprehensive Income (Loss), Net Of Tax Accumulated other comprehensive income, net of tax Accumulated other comprehensive income, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Stockholders Equity Attributable To Parent Total shareholders' equity Total shareholders' equity Balance Balance Liabilities and Equity Total liabilities and shareholders' equity Total liabilities and shareholders' equity Short-Term Investments Short term investments (in dollars) Short-term Investments, Total Allowance For Doubtful Accounts Receivable, Current Allowance for doubtful accounts (in dollars) Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Allowance for Doubtful Accounts Receivable, Current, Ending Balance Common Stock, Par Or Stated Value Per Share Common stock, Par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total Treasury Stock, Shares Treasury stock shares Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares, Ending Balance Income Statement [Abstract] Income Statement [Abstract] Revenue, Net [Abstract] Revenues: Subscription Revenue Investment periodicals and related publications Licenses Revenue Copyright data fees Asset Management Fees Investment management fees & services Revenue, Net Total revenues Total revenues Operating Expenses [Abstract] Expenses: Marketing and Advertising Expense Advertising and promotion Advertising and promotion Labor and Related Expense Salaries and employee benefits Salaries and employee benefits Other Selling and Marketing Expense Production and distribution Other General and Administrative Expense Office and administration Restructuring Charges Expenses related to restructuring Provision For Settlement Provision for settlement Represents expenses related to the Settlement with the SEC. Operating Expenses Total expenses Total expenses Operating Income (Loss) Income from operations Income (loss) from operations Deconsolidation, Gain (Loss), Amount Gain on deconsolidation of subsidiaries Gain on deconsolidation of subsidiaries Investment Income, Net Income from securities transactions, net Income from securities transactions, net Income Tax Expense (Benefit) Income tax provision Income tax provision Net Income (Loss) Attributable To Parent Net income Net income (loss) Net income (loss) Earnings Per Share, Basic and Diluted Earnings (loss) per share, basic & fully diluted (in dollars per share) Earnings per share, basic & fully diluted Weighted Average Number Of Shares Outstanding, Basic and Diluted Weighted average number of common shares (in shares) Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net Cash Provided By (Used In) Operating Activities [Abstract] Cash flows from operating activities: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided (used) by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Amortization Of Debt Discount (Premium) Amortization of bond premium Share-Based Compensation Post-employment non-cash compensation Non Voting Revenues Interest In Variable Entity Non-voting revenues interest in EAM Trust The component of interest received representing the income received against non voting revenues in variable entity. Non-voting revenues interest in EAM Trust Non Voting Profits Interest In Variable Entity Non-voting profits interest in EAM Trust The component of interest received representing the income received against non voting profits in variable entity. Non-voting profits interest in EAM Trust Available-For-Sale Securities, Gross Realized Gains Realized and unrealized losses on securities available-for-sale Realized and unrealized losses on securities available-for-sale Deferred Income Tax Expense (Benefit) Deferred income taxes Expenses For Operating Lease Exit Obligation Expenses for operating lease exit obligation Represents expeses related to operating lease exit obligation. Increase (Decrease) In Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) In Deferred Revenue Unearned revenue Increase (Decrease) In Reserve For Settlement Reserve for settlement The change in the reserve for settlement recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations. Increase (Decrease) In Operating Lease Exit Obligation Operating lease exit obligation The change in the operating lease exit obligation recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations. Increase (Decrease) In Accounts Payable and Accrued Liabilities Accounts payable & accrued expenses (Decrease) in accounts payable & accrued expenses Increase (Decrease) In Accrued Salaries Accrued salaries Increase (Decrease) In Accrued Taxes Payable Accrued taxes on income (Decrease) in accrued taxes payable Increase (Decrease) In Prepaid and Refundable Income Taxes Prepaid and refundable income taxes The increase (decrease) during the reporting period in the amount of payments made in advance and refundable for income taxes, which will be charged against earnings in future periods. Prepaid and refundable income taxes Increase (Decrease) In Prepaid Expense and Other Assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) In Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) In Due From Affiliates, Current Receivable from affiliates Receivable from affiliates Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities Total adjustments Total adjustments Net Cash Provided By (Used In) Operating Activities Net cash provided by operating activities Net cash provided (used) by operating activities Net Cash Provided By (Used In) Investing Activities [Abstract] Cash flows from investing activities: Purchases Sales Of Securities Classified As Available For Sale [Abstract] Purchases/sales of securities classified as available-for-sale: Proceeds From Sale Of Available-For-Sale Securities, Equity Proceeds from sales of equity securities Payments To Acquire Available-For-Sale Securities, Debt Purchases of fixed income securities Purchases of fixed income securities Payments To Acquire Available-For-Sale Securities, Equity Purchases of equity securities Purchases of equity securities Payments To Acquire Additional Interest In Subsidiaries Cash contribution to deconsolidated subsidiary capita Cash contribution to deconsolidated subsidiary capital Distribution From Variable Entity, Investing Activities Distributions received from EAM Trust The cash inflow associated with the Profits or revenue distribution from variable entity. Payments To Acquire Property, Plant, and Equipment Acquisition of property and equipment Acquisition of property and equipment Payments For Software Expenditures for capitalized software Expenditures for capitalized software Net Cash Provided By (Used In) Investing Activities Net cash provided by investing activities Net cash provided by investing activities Net Cash Provided By (Used In) Financing Activities [Abstract] Cash flows from financing activities: Payments For Repurchase Of Common Stock Purchase of treasury stock at cost Purchase of treasury stock at cost Payments Of Dividends, Common Stock Dividends paid Dividends paid Net Cash Provided By (Used In) Financing Activities Net cash used in financing activities Net cash used by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash and cash equivalents Net change in cash and cash equivalents Statement Of Stockholders Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Common Stock [Member] Common stock Additional Paid-In Capital [Member] Additional paid-in capital Treasury Stock [Member] Treasury Stock Comprehensive Income [Member] Comprehensive income/(loss) Retained Earnings [Member] Retained earnings Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive income/(loss) Statement [Line Items] Statement [Line Items] Increase (Decrease) In Stockholders Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares, Issued Balance at April 30, 2011 Balance (in shares) Balance (in shares) Comprehensive Income (Loss), Net Of Tax, Attributable To Parent [Abstract] Comprehensive income Other Comprehensive Income (Loss), Net Of Tax [Abstract] Other comprehensive income, net of tax: Comprehensive Income (Loss), Net Of Tax, Attributable To Parent, Total Comprehensive income Comprehensive income Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock Purchase of treasury stock Treasury Stock, Shares, Acquired Purchase of treasury stock Purchase of treasury stock (in shares) Dividends, Common Stock Dividends declared Dividends declared Dividends declared Common Stock, Dividends, Per Share, Declared Dividends declared per share (in dollars per share) Organization, Consolidation and Presentation Of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation Of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization and Summary of Significant Accounting Policies: Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Cash Flow, Supplemental Disclosures [Text Block] Supplementary Cash Flow Information: Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions: Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Investments In Debt and Marketable Equity Securities (And Certain Trading Assets) Disclosure [Text Block] Investments: Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Text Block] Variable Interest Entity The entire disclosure for Categorization of Variable Interest Entities (VIE) for consolidation and (or) disclosure purposes, whether individually or in aggregate, by: (1) VIEs consolidated because the entity is the primary beneficiary, (2) VIEs not consolidated because the entity is not the primary beneficiary, and (3) VIEs or potential VIEs that are not consolidated because necessary information is not available. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property and Equipment: Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Federal, State and Local Income Taxes: Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs, Share-Based Payments [Text Block] Employees' Profit Sharing and Savings Plan: Leases [Abstract] Lease Commitments: Leases Of Lessee Disclosure [Text Block] Lease Commitments: Segment Reporting [Abstract] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Business Segments: Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Concentration Risk Disclosure [Text Block] Disclosure of Credit Risk of Financial Instruments with Off-Balance Sheet Risk: Comprehensive Income (Loss) Note [Abstract] Comprehensive Income (Loss) Note [Abstract] Comprehensive Income (Loss) Note [Text Block] Comprehensive Income: Internal Use Software [Abstract] Internal Use Software [Abstract] Internal Use Software Disclosure [Text Block] Accounting for the Costs of Computer Software Developed for Internal Use: Disclosure of accounting policy for its computer software activities including the accounting treatment for costs incurred for (1) research and development activities, (2) development of computer software for internal use, (3) in-process research and development acquired in a purchase business combination. Treasury Stock [Abstract] Treasury Stock [Abstract] Treasury Stock [Text Block] Treasury Stock and Repurchase Program: Legal Proceedings and Restructuring [Abstract] Legal Proceedings and Restructuring [Abstract] Legal Matters and Contingencies [Text Block] Legal Proceedings and Restructuring: Equity Component [Domain] Equity Component [Domain] Assets [Abstract] Assets Equity Method Investments Investment in EAM Trust Income (Loss) from Continuing Operations before Income Taxes, Domestic Income (loss) before income taxes Income (loss) before income taxes Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Change in unrealized losses on securities, net of taxes Due from Affiliate, Current Receivable from affiliates Proceeds from Sale of Available-for-sale Securities, Debt Maturities and sales of fixed income securities Revenues And Profits Distribution From Eam Trust The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from Revenues and profits distribution from EAM Trust. Revenues and profits interests in EAM Trust Capitalized Computer Software, Net Capitalized software and other intangible assets, net Capitalized Computer Software, Impairments Writedown of software Proceeds from (Payments for) Trading Securities Proceeds from sales of trading securities