Loss Contingencies Arising From Representations And Warranties of Our Discontinued Mortgage Operations Loss Contingencies Arising From Representations and Warranties of Our Discontinued Mortgage Operations (Narrative) (Details) (USD $)	9 Months Ended	36 Months Ended	60 Months Ended	12 Months Ended
	Jan. 31, 2014	Apr. 30, 2007	Apr. 30, 2013	Apr. 30, 2013 SCC [Member]	Apr. 30, 2012 SCC [Member]	Jan. 31, 2014 SCC [Member]	Jan. 31, 2013 SCC [Member]
Loss Contingencies [Line Items]
Percentage of fraud on originated loans		68.00%
Claims received for loans	$ 70,300,000		$ 2,100,000,000	$ 190,000,000	$ 1,100,000,000
Claims subject to review by SCC, amount	1,200,000
Reassertion of previously denied claims	0
Increase In Losses Due To Assumed One Percent Increase In Validity Rates And Loss Severities	40,000,000
Loss Contingency Accrual, at Carrying Value				$ 158,765,000	$ 130,018,000	$ 158,765,000	$ 118,765,000