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Business Combinations - Additional Information (Detail) (USD $) In Thousands	Jul. 31, 2011
Business Acquisition [Line Items]
Total consideration for acquisition of one privately-held company	$ 1,890

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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