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Income Taxes (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2013 | Apr. 30, 2010
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from discontinued operations | $ (24,582,000) | $ (793,000) | $ (4,044,000) | $ (1,791,000) | $ (5,600,000) | $ 218,000 | $ (18,711,000) | $ (55,943,000) | $ (31,210,000) | $ (80,036,000) | $ 13,563,000 |  |
Discontinued Operation, Tax Effect of Operations of Discontinued Operation |  |  |  |  |  |  |  |  | (19,662,000) | (13,329,000) | 13,814,000 |  |
Tax expense (benefit) from discontinued operations |  |  |  |  |  |  |  |  |  | (74,900,000) |  |  |
Effective tax rate on discontinued operations |  |  |  |  |  |  |  |  | 38.60% | 48.40% | 50.50% |  |
Deferred tax asset | 229,332,000 |  |  |  | 235,385,000 |  |  |  | 229,332,000 | 235,385,000 |  | 229,332,000 |
Operating loss carryforwards | 124,000,000 |  |  |  |  |  |  |  | 124,000,000 |  |  | 124,000,000 |
Unrecognized tax benefit | 146,391,000 |  |  |  | 206,393,000 |  |  |  | 146,391,000 | 206,393,000 | 154,848,000 | 146,391,000 | 129,767,000
Unrecognized tax benefits that would impact effective tax rate | 95,300,000 |  |  |  | 150,400,000 |  |  |  | 95,300,000 | 150,400,000 | 117,600,000 | 95,300,000 |
Effect of anticipated settlements of audit issues and expiring statutes of limitations | 38,000,000 |  |  |  |  |  |  |  | 38,000,000 |  |  | 38,000,000 |
Increase (decrease) in gross interest and penalties accrued on uncertain tax positions |  |  |  |  |  |  |  |  |  | (5,500,000) | 4,400,000 | (6,900,000) |
Total gross interest and penalties accrued | 31,700,000 |  |  |  | 38,600,000 |  |  |  | 31,700,000 | 38,600,000 | 44,100,000 | 31,700,000 |
Valuation Allowance, Deferred Tax Asset, Change in Amount |  |  |  |  |  |  |  |  | 22,800,000 |  |  |  |
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance |  |  |  |  |  |  |  |  | (5,500,000) |  |  |  |
Statutory federal tax rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% |  |
Settlement reducing uncertain tax benefits |  |  |  |  |  |  |  |  | 25,259,000 | 8,742,000 | 7,639,000 |  |
Income Taxes Receivable | 151,300,000 |  |  |  |  |  |  |  | 151,300,000 |  |  | 151,300,000 |
Taxes Payable | 15,200,000 |  |  |  |  |  |  |  | 15,200,000 |  |  | 15,200,000 |
Income Taxes, Net, Expected Federal Refund | 136,100,000 |  |  |  |  |  |  |  | 136,100,000 |  |  | 136,100,000 |
Ameriprise |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset | 48,200,000 |  |  |  | 85,800,000 |  |  |  | 48,200,000 | 85,800,000 |  | 48,200,000 |
Valuation allowance | 39,000,000 |  |  |  | 63,600,000 |  |  |  | 39,000,000 | 63,600,000 |  | 39,000,000 |
State And Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset | 20,100,000 |  |  |  |  |  |  |  | 20,100,000 |  |  | 20,100,000 |
Valuation allowance | 14,400,000 |  |  |  |  |  |  |  | 14,400,000 |  |  | 14,400,000 |
1999 - 2007 Tax Returns [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement reducing uncertain tax benefits |  |  |  |  |  |  |  |  | 59,000,000 |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | $ 33,300,000 |  |  |  |

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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration