Fair Value Measurement - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011
Fair Value, Measurement Inputs, Disclosure [Line Items]
Fair value of contingent consideration included in accrued liabilities	$ 795
Fair value of contingent consideration included in other long term liabilities	4,876
Current portion of notes payable		2,000
Short-term borrowings	$ 7,600	$ 15,544

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant