Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2019	Nov. 30, 2018	[1]	Nov. 30, 2017	[1]
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 117,038	$ 106,716	$ 99,995	$ 89,549	$ 98,104	$ 92,603	$ 92,864	$ 95,410	$ 413,298	$ 378,981		$ 389,154
Gross profit	96,272	85,891	82,384	73,510	81,373	75,907	76,221	78,507	338,057	312,008		319,995
Income (loss) from operations	(6,026)	15,960	14,741	15,409	11,030	19,103	18,550	19,131	40,084	67,814		57,490
Net income	$ (4,740)	$ 13,557	$ 8,181	$ 9,402	$ 8,644	$ 14,390	$ 12,904	$ 13,732	$ 26,400	$ 49,670	[2],[3]	$ 29,021	[2],[3]
Basic (loss) earnings per share (in dollars per share)	$ (0.11)	$ 0.30	$ 0.18	$ 0.21	$ 0.19	$ 0.32	$ 0.28	$ 0.30	$ 0.59	$ 1.09		$ 0.60
Diluted (loss) earnings per share (in dollars per share)	$ (0.11)	$ 0.30	$ 0.18	$ 0.21	$ 0.19	$ 0.32	$ 0.28	$ 0.29	$ 0.58	$ 1.08		$ 0.60

[1] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.

[2] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.

[3] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.