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Restatement of Consolidated Financial Statements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2010
Accounting Changes and Error Corrections [Abstract]
Cumulative adjustments on previously reported retained earnings	$ 1.1

Net of tax adjustment in the annual report for the year in which a restatement is made, of the resulting effects on the net income of prior periods on the beginning balance of retained earnings for the current period.

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