Shareholders' Equity (Deficit) - Summary of Stock Appreciation Rights (Detail) (Stock Appreciation Rights [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Nov. 30, 2013
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock, Beginning Balance	1,529,000
Stock, Granted	73,000
Stock, Exercised	(138,000)
Stock, Cancelled	(7,000)
Stock, Ending Balance	1,457,000
Stock, Exercisable at ending balance	1,366,000
Expected to vest at ending balance	89,000
Weighted Average Exercise Price, Beginning Balance	$ 10.47
Weighted Average Exercise Price, Granted	$ 13.17
Weighted Average Exercise Price, Exercised	$ 7.92
Weighted Average Exercise Price, Cancelled	$ 4.95
Weighted Average Exercise Price, Ending Balance	$ 10.88
Weighted Average Exercise Price, Exercisable at November 30, 2013	$ 10.99
Weighted Average Exercise Price, Expected to vest at November 30, 2013	$ 9.18
Weighted Average Remaining Contractual Life, Outstanding at November 30, 2013	3 years 7 months 6 days
Weighted Average Remaining Contractual Life, Exercisable at November 30, 2013	3 years 4 months 24 days
Weighted Average Remaining Contractual Life, Expected to vest at November 30, 2013	5 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding at November 30, 2013	$ 11.1
Aggregate Intrinsic Value, Exercisable at November 30, 2013	10.3
Aggregate Intrinsic Value, Expected to vest at November 30, 2013	$ 0.8