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Summary of Property and Equipment by Major Country (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Nov. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 94,862	$ 89,871
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	84,144	83,500
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	1,089	1,386
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 9,629	$ 4,985

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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