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Sale of SEI Asset Korea Sale of SEI Asset Korea (Narrative) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Percentage of Ownership before Transaction |  |  |  |  | 56.10%
Disposal Group, Including Discontinued Operation, Segment that Includes Disposal Group |  |  |  |  | Private Banks
Assets | $ 1,309,824 | $ 1,294,559 |  |  | $ 54,783
Cash and Cash Equivalents, at Carrying Value | 452,247 | 420,986 | 496,292 | 590,877 | 48,306
Accrued Income Taxes, Noncurrent |  |  |  |  | $ 4,815

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