Income Taxes - Reconciliation of Change in Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 4.9	$ 4.5	$ 4.8
Gross increases for tax positions taken during the year	0.2	0.2	0.1
Gross increases for tax positions taken in the prior year	2.3	0.3
Gross decreases for tax positions taken in prior year		(0.1)	(0.4)
Expiration of statutes of limitation	(0.9)
Unrecognized tax benefits, Ending Balance	$ 6.5	$ 4.9	$ 4.5