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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
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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 |

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