(Loss) Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Earnings Per Share [Abstract]
Net (loss) income	$ (73,793)	$ 7,576	$ 7,275	$ 3,216	$ (9,473)	$ (4,126)	$ 5,769	$ (971)	$ (55,726)	$ (8,801)	$ 49,458
Weighted average shares outstanding (in shares)									49,481	50,391	50,840
Dilutive impact from common stock equivalents (in shares)									0	0	626
Diluted weighted average shares outstanding (in shares)									49,481	50,391	51,466
Basic (loss) earnings per share (in dollars per share)	$ (1.52)	$ 0.16	$ 0.15	$ 0.06	$ (0.19)	$ (0.08)	$ 0.11	$ (0.02)	$ (1.13)	$ (0.17)	$ 0.97
Diluted (loss) earnings per share (in dollars per share)	$ (1.52)	$ 0.15	$ 0.14	$ 0.06	$ (0.19)	$ (0.08)	$ 0.11	$ (0.02)	$ (1.13)	$ (0.17)	$ 0.96