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Accrued Restructuring and Excess Facilities Costs - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2012	Nov. 30, 2011
Restructuring Cost and Reserve [Line Items]
Accrued restructuring and excess facilities costs classified as long-term liabilities	$ 966	$ 1,050
Accrued restructuring and excess facilities costs	$ 1,963	$ 7,842

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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