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Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 111,333	$ 95,683	$ 96,102	$ 94,047	$ 116,079	$ 97,310	$ 93,213	$ 90,970	$ 397,165	$ 397,572	$ 405,341
Gross profit	94,602	78,987	79,459	77,144	98,120	79,235	75,846	75,212	330,192	328,413	339,629
Income (loss) from operations	24,259	22,183	21,788	17,768	28,809	20,299	20,284	1,222	85,998	70,614	(29,709)
Net income (loss)	$ 18,430	$ 16,746	$ 15,403	$ 12,912	$ 16,429	$ 11,172	$ 10,341	$ (525)	$ 63,491	$ 37,417	$ (55,726)
Basic earnings (loss) per share (in dollars per share)	$ 0.41	$ 0.37	$ 0.34	$ 0.28	$ 0.35	$ 0.23	$ 0.21	$ (0.01)	$ 1.39	$ 0.78	$ (1.13)
Diluted earnings (loss) per share (in dollars per share)	$ 0.41	$ 0.37	$ 0.33	$ 0.27	$ 0.34	$ 0.23	$ 0.21	$ (0.01)	$ 1.38	$ 0.77	$ (1.13)

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