Fair Value Fair Value (Summary Of Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Apr. 30, 2015	Jul. 31, 2014	Apr. 30, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash & cash equivalents	$ 1,299,382	$ 2,007,190	$ 1,429,489	$ 2,185,307
Cash and cash equivalents, Estimated Fair Value	1,299,382	2,007,190
Cash and cash equivalents - restricted, Carrying Amount	61,040	91,972	71,917
Cash and cash equivalents - restricted, Estimated Fair Value	61,040	91,972
Receivables, net	103,194	167,964	122,315
Receivables, net - short-term, Estimated Fair Value	103,194	167,964
Mortgage loans held for investment, less allowance for loan losses of $7,659, $10,561 and $7,886	230,130	239,338	259,732
Loans Receivable, Fair Value Disclosure	184,277	190,196
Investments in available-for-sale securities, Estimated Fair Value	407,426	441,709	408,063
Accounts Receivable, Net, Noncurrent	72,427	80,867	101,146
Receivables, net - long-term, Estimated Fair Value	72,427	80,867	101,146
Total Portfolio	235,848	245,216	268,087
Deposits, Estimated Fair Value	473,720	737,261	480,729
Long-term Debt	505,996	506,088
Long-term borrowings, Estimated Fair Value	552,431	556,769
Contingent consideration payments, carrying amount	10,650	10,667
Contingent consideration payments, estimated fair value	10,650	10,667
Level 1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents, Estimated Fair Value			1,429,489
Cash and cash equivalents - restricted, Estimated Fair Value			71,917
Receivables, net - short-term, Estimated Fair Value			122,315
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, Fair Value Disclosure			193,920
Long-term Debt			906,419
Long-term borrowings, Estimated Fair Value			965,650
Contingent consideration payments, carrying amount			9,168
Contingent consideration payments, estimated fair value			9,168
Level 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments in available-for-sale securities, Estimated Fair Value			408,063
HRB Bank [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Deposits, Carrying Amount	$ 477,145	$ 744,699	$ 483,477