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Debt and Credit Lines - Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012	Dec. 09, 2010
Debt Instrument [Line Items]
Long-term debt	$ 445.5	$ 446.0
Less: current portion	(2.0)	(2.0)
Unamortized original issue discount	(1.3)	(1.4)
Long-term debt	442.2	442.6
Term Loan B
Debt Instrument [Line Items]
Long-term debt	195.5	196.0
Unamortized original issue discount			(2.0)
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt	250.0	250.0
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

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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