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Restructuring and Severance - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	May 31, 2011	May 31, 2012	May 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring and severance	$ 0.5	$ 0.4	$ 1.3
Segment, Continuing Operations
Restructuring Cost and Reserve [Line Items]
Restructuring and severance		0.4
Segment, Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Restructuring and severance		$ 0.6

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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