Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011		Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 537,754		$ 572,974
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	336,689
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	201,065
Less Than 60 Days Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	36,979
Less Than 60 Days Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	27,296
Less Than 60 Days Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	9,683
60 To 89 Days Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	7,415
60 To 89 Days Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	6,614
60 To 89 Days Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	801
90 Days + Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	160,587	[1]
90 Days + Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	139,761	[1]
90 Days + Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	20,826	[1]
Total Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	204,981
Total Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	173,671
Total Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	31,310
Current [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	332,773
Current [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	163,018
Current [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 169,755

[1] No loans past due 90 days or more are still accruing interest.