Earnings (Loss) Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Earnings Per Share [Abstract]
Net (loss) income (in dollars)	$ 12,912	$ (525)
Weighted average shares outstanding (in shares)	46,529	48,733
Dilutive impact from common stock equivalents (in shares)	947	0
Diluted weighted average shares outstanding (in shares)	47,476	48,733
Basic (loss) earnings per share (in dollars per share)	$ 0.28	$ (0.01)
Diluted (loss) earnings per share (in dollars per share)	$ 0.27	$ (0.01)