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Separate Financial Information of Subsidiary Guarantors of Indebtedness - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Feb. 28, 2013	Nov. 30, 2012	Feb. 28, 2013 Senior Unsecured Notes	Feb. 28, 2013 Domestic Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 445.5	$ 446.0	$ 250.0
Domestic subsidiaries Rate				100.00%

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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