Fair Value Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended					9 Months Ended				9 Months Ended
	Apr. 30, 2013	Jan. 31, 2013	Apr. 30, 2012	Jan. 31, 2014 Third Party Pricing REO	Jan. 31, 2014 Third Party Pricing Minimum REO	Jan. 31, 2014 Third Party Pricing Maximum REO	Jan. 31, 2014 Third Party Pricing Weighted Average REO	Jan. 31, 2014 Collateral-Based Impaired Mortgage Loans Held For Investment - Non TDRs	Jan. 31, 2014 Collateral-Based Impaired Mortgage Loans Held For Investment - TDRs	Jan. 31, 2014 Collateral-Based Minimum Impaired Mortgage Loans Held For Investment - Non TDRs	Jan. 31, 2014 Collateral-Based Maximum Impaired Mortgage Loans Held For Investment - Non TDRs	Jan. 31, 2014 Collateral-Based Weighted Average Impaired Mortgage Loans Held For Investment - Non TDRs	Jan. 31, 2014 Discounted Cash Flow Impaired Mortgage Loans Held For Investment - Non TDRs	Jan. 31, 2014 Discounted Cash Flow Minimum Impaired Mortgage Loans Held For Investment - TDRs	Jan. 31, 2014 Discounted Cash Flow Maximum Impaired Mortgage Loans Held For Investment - TDRs	Jan. 31, 2014 Discounted Cash Flow Weighted Average Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgage Loans on Real Estate	$ 13,968	$ 13,852	$ 14,972	$ 8,230
Fair value									$ 40,264				$ 75,073
Cost to list/sell					5.00%	34.00%	5.00%			0.00%	2.00%	9.00%
Loss severity					0.00%	100.00%	53.00%			0.00%	100.00%	60.00%		0.00%	22.00%	6.00%
Time to sell (in months)								24 months				24 months
Collateral depreciation										(132.00%)	100.00%	41.00%
Aged default performance														26.00%	41.00%	33.00%