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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Aug. 31, 2011	Aug. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Changes in carrying value of goodwill	$ 0	$ 0

The change during the reporting period in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment during the period, goodwill written off related to the sale of a business or other adjustments to goodwill.

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