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	12 Months Ended	36 Months Ended	60 Months Ended		12 Months Ended				12 Months Ended
	Jul. 31, 2011	Apr. 30, 2013	Apr. 30, 2007	Apr. 30, 2013	Apr. 30, 2013 American International Group, Inc [Member]	Apr. 30, 2013 SCC [Member]	Apr. 30, 2012 SCC [Member]	Apr. 30, 2011 SCC [Member]	Apr. 30, 2010 SCC [Member]	Apr. 30, 2013 Leasehold Improvements [Member]
Loss Contingencies [Line Items]
Percentage of fraud on originated loans			68.00%
Claims received for loans	$ 31,000,000			$ 2,100,000,000		$ 190,000,000	$ 1,100,000,000
Claims subject to review by SCC, amount		41,000,000		41,000,000
Reassertion of previously denied claims		11,000,000		11,000,000
Percentage Of Claims Denied		90.00%
Loss Contingency, Range of Possible Loss, Maximum					650,000,000
Incremental provision						40,000,000	20,000,000	0
Increase In Losses Due To Assumed One Percent Increase In Validity Rates And Loss Severities		30,000,000
Estimated useful life										8 years
Loss Contingency Accrual, at Carrying Value						$ 158,765,000	$ 130,018,000	$ 126,260,000	$ 188,200,000