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Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Loans and Leases Rollforward [Roll Forward]    
Balance at beginning of the period $ 11,272us-gaap_LoansAndLeasesReceivableAllowance $ 14,314us-gaap_LoansAndLeasesReceivableAllowance
Provision 1,090us-gaap_ProvisionForLoanAndLeaseLosses 7,224us-gaap_ProvisionForLoanAndLeaseLosses
Recoveries 1,155us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 3,250us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Charge-offs (4,142)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (13,225)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Balance at end of the period $ 9,375us-gaap_LoansAndLeasesReceivableAllowance $ 11,563us-gaap_LoansAndLeasesReceivableAllowance