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Fair Value Measurements (Details Textual)
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3 Months Ended | ||
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Jul. 31, 2012
USD ($)
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Jul. 31, 2012
EUR (€)
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Jan. 31, 2012
USD ($)
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| Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | $ 5,600,000 | ||
| Investment Foreign Currency, Contract, Amount Purchased | 1,200,000 | ||
| Foreign Currency Transaction Loss, before Tax | $ 36,000 |
| X | ||||||||||
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- Definition
The amount of a currency that the reporting entity is obligated to purchase at settlement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| 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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| X | ||||||||||
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- Definition
Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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