Loss Contingencies Arising From Representations and Warranties of Our Discontinued Mortgage Operations (Narrative) (Details) (USD $)	36 Months Ended	48 Months Ended	60 Months Ended
	Apr. 30, 2007	Apr. 30, 2012	Apr. 30, 2013	Jan. 31, 2015	Apr. 30, 2014	Jan. 31, 2014
Loss Contingencies [Line Items]
Percentage of fraud on originated loans	68.00%
Claims received for loans		$ 1,800,000,000	$ 2,200,000,000
Loss Contingency Accrual				8,900,000	23,700,000	20,900,000
Principal Assets of SCC				470,000,000
SCC [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross			$ 158,765,000	$ 143,765,000	$ 183,765,000	$ 158,765,000