Mortgage Loans Held For Investment And Related Assets (Information Related To Activities Of Non-Performing Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Apr. 30, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Average impaired loans	$ 155,615	$ 174,396	$ 159,361
Interest income on impaired loans	921	1,093	4,130
Interest income on impaired loans recognized on a cash basis on non-accrual status	893	1,067	4,025
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Average impaired loans	130,287	147,555	133,936
Interest income on impaired loans	848	1,011	3,825
Interest income on impaired loans recognized on a cash basis on non-accrual status	820	994	3,746
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Average impaired loans	25,328	26,841	25,425
Interest income on impaired loans	73	82	305
Interest income on impaired loans recognized on a cash basis on non-accrual status	$ 73	$ 73	$ 279