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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
6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2012
Apr. 30, 2012
Oct. 31, 2011
Apr. 30, 2011
Oct. 31, 2012
Level 1 [Member]
Apr. 30, 2012
Level 1 [Member]
Oct. 31, 2012
Level 2 [Member]
Apr. 30, 2012
Level 2 [Member]
Oct. 31, 2012
Level 3 [Member]
Apr. 30, 2012
Level 3 [Member]
Oct. 31, 2012
Level 1 And 3 [Member]
Apr. 30, 2012
Level 1 And 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Cash and cash equivalents, Carrying Amount $ 1,260,901 $ 1,944,334 $ 572,611 $ 1,677,844 $ 1,260,901 $ 1,944,334            
Cash and cash equivalents, Estimated Fair Value         1,260,901 1,944,334            
Cash and cash equivalents - restricted, Carrying Amount 38,667 48,100     38,667 48,100            
Cash and cash equivalents - restricted, Estimated Fair Value         38,667 48,100            
Receivables, net 124,511 193,858 128,062   124,511 193,858            
Receivables, net - short-term, Estimated Fair Value         124,511 193,858            
Mortgage loans held for investment 370,850 406,201             370,850 406,201    
Mortgage loans held for investment, net, Estimated Fair Value                 226,885 248,535    
Investments in available-for-sale securities, Carrying Amount 388,640 371,315         389,654 372,352        
Investments in available-for-sale securities, Fair Value 389,654 372,352         389,654 372,352        
Receivables, net - long-term, Carrying Amount                     134,359 127,468
Receivables, net - long-term, Estimated Fair Value                     134,359 127,468
Note receivable (including interest), Carrying Amount                 58,049 55,444    
Note receivable (including interest), Estimated Fair Value                 64,508 55,444    
Customer deposits 790,106 827,549                 795,519 833,047
Deposits, Estimated Fair Value                     795,227 831,251
Long-term debt, Carrying Amount 906,125 409,115 1,009,196           1,506,803 1,040,549    
Long-term debt, Estimated Fair Value                 $ 1,540,333 $ 1,077,223