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 $)	3 Months Ended	36 Months Ended	60 Months Ended	12 Months Ended
	Jul. 31, 2013	Apr. 30, 2007	Apr. 30, 2013	Apr. 30, 2013 SCC [Member]	Apr. 30, 2012 SCC [Member]	Jul. 31, 2013 SCC [Member]	Jul. 31, 2012 SCC [Member]
Loss Contingencies [Line Items]
Percentage of fraud on originated loans		68.00%
Claims received for loans	$ 68,600,000		$ 2,100,000,000	$ 190,000,000	$ 1,100,000,000
Claims subject to review by SCC, amount	71,700,000
Reassertion of previously denied claims	1,900,000
Increase In Losses Due To Assumed One Percent Increase In Validity Rates And Loss Severities	30,000,000
Loss Contingency Accrual, at Carrying Value				$ 158,765,000	$ 130,018,000	$ 158,765,000	$ 129,265,000