Fair Value (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014
Third Party Pricing | Minimum | REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	5.00%
Loss severity	0.00%
Third Party Pricing | Maximum | REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	34.00%
Loss severity	100.00%
Third Party Pricing | Weighted Average | REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	5.00%
Loss severity	53.00%
Collateral-Based | Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Time to sell (in months)	24 months
Collateral-Based | Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 35,964
Collateral-Based | Minimum | Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	0.00%
Loss severity	0.00%
Collateral depreciation	(166.00%)
Collateral-Based | Maximum | Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	1.90%
Loss severity	100.00%
Collateral depreciation	100.00%
Collateral-Based | Weighted Average | Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cost to list/sell	9.00%
Loss severity	61.00%
Time to sell (in months)	24 months
Collateral depreciation	39.00%
Discounted Cash Flow | Impaired Mortgage Loans Held For Investment - Non TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 69,157
Discounted Cash Flow | Minimum | Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	0.00%
Aged default performance	24.00%
Discounted Cash Flow | Maximum | Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	22.00%
Aged default performance	38.00%
Discounted Cash Flow | Weighted Average | Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity	7.00%
Aged default performance	31.00%