Fair Value Measurement Fair Value Of Financial Instruments (Summary Of Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012	Apr. 30, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash & cash equivalents	$ 790,772	$ 1,747,584	$ 1,260,901	$ 1,944,334
Cash and cash equivalents, Estimated Fair Value	790,772	1,747,584
Cash and cash equivalents - restricted, Carrying Amount	47,521	117,837	38,667
Cash and cash equivalents - restricted, Estimated Fair Value	47,521	117,837
Receivables, net - short-term, Carrying Amount	131,701	206,835	124,511
Receivables, net - short-term, Estimated Fair Value	133,884	206,810
Mortgage loans held for investment, less allowance for loan losses of $12,704, $18,125 and $14,314	295,907	338,789	370,850
Loans Receivable, Fair Value Disclosure	211,690	210,858
Investments in available-for-sale securities, Carrying Amount	465,344	486,876	388,640
Investments in available-for-sale securities, Estimated Fair Value	465,344	486,876	389,654
Receivables, net - long-term, Carrying Amount	129,180	125,048
Receivables, net - long-term, Estimated Fair Value	130,023	134,283
Note receivable (including interest), Estimated Fair Value	69,827	69,472
Total Portfolio	306,103	350,235	385,867
Deposits, Estimated Fair Value	656,300	934,019
Long-term borrowings, Carrying Amount	906,581	906,680
Long-term borrowings, Estimated Fair Value	947,350	964,630
Contingent business acquisition obligations	12,454	11,277
Cusiness Combination, Contingent Consideration, at Fair Value	12,454	11,277
Level 1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents, Estimated Fair Value			1,260,901
Cash and cash equivalents - restricted, Estimated Fair Value			38,667
Receivables, net - short-term, Estimated Fair Value			124,511
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, Fair Value Disclosure			226,885
Note receivable (including interest), Carrying Amount			58,049
Note receivable (including interest), Estimated Fair Value			64,508
Long-term borrowings, Carrying Amount			1,506,803
Long-term borrowings, Estimated Fair Value			1,540,333
Contingent business acquisition obligations			10,277
Cusiness Combination, Contingent Consideration, at Fair Value			10,277
Level 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments in available-for-sale securities, Carrying Amount			389,654
Investments in available-for-sale securities, Estimated Fair Value			389,654
Level 1 And 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Receivables, net - long-term, Carrying Amount			134,359
Receivables, net - long-term, Estimated Fair Value			134,359
Deposits, Carrying Amount			795,519
Deposits, Estimated Fair Value			795,227
Mcgladrey Pullen Llp [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total Portfolio	62,786	60,352	58,000
HRB Bank [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deposits, Carrying Amount	$ 656,305	$ 938,331