Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $) In Thousands	Jul. 31, 2011		Apr. 30, 2011
Portfolio balance	$ 553,991		$ 572,974
Less Than 60 Days Past Due [Member]
Portfolio balance	46,430
Less Than 60 Days Past Due [Member] | Purchased From SCC [Member]
Portfolio balance	35,960
Less Than 60 Days Past Due [Member] | All Other [Member]
Portfolio balance	10,470
60 To 89 Days Past Due [Member]
Portfolio balance	10,621
60 To 89 Days Past Due [Member] | Purchased From SCC [Member]
Portfolio balance	8,886
60 To 89 Days Past Due [Member] | All Other [Member]
Portfolio balance	1,735
90 Days + Past Due [Member]
Portfolio balance	154,246	[1]
90 Days + Past Due [Member] | Purchased From SCC [Member]
Portfolio balance	133,767	[1]
90 Days + Past Due [Member] | All Other [Member]
Portfolio balance	20,479	[1]
Total Past Due [Member]
Portfolio balance	211,297
Total Past Due [Member] | Purchased From SCC [Member]
Portfolio balance	178,613
Total Past Due [Member] | All Other [Member]
Portfolio balance	32,684
Current [Member]
Portfolio balance	342,694
Current [Member] | Purchased From SCC [Member]
Portfolio balance	168,082
Current [Member] | All Other [Member]
Portfolio balance	174,612
Purchased From SCC [Member]
Portfolio balance	346,695
All Other [Member]
Portfolio balance	$ 207,296

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