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Fair Value Measurements (Details Textual) (USD $)
In Millions, unless otherwise specified |
Jan. 31, 2012
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| Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | $ 5.6 |
| X | ||||||||||
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- Definition
Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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