Condensed Consolidated Statements of Shareholders’ Equity - USD ($)	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Nov. 30, 2018			45,115,000
Beginning balance at Nov. 30, 2018	$ 324,002,000	$ (3,397,000)	$ 451,000	$ 266,602,000	$ 85,125,000	$ (3,397,000)	$ (28,176,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			99,000
Issuance of stock under employee stock purchase plan	2,803,000		$ 1,000	2,802,000
Exercise of stock options (in shares)			44,000
Exercise of stock options	1,317,000			1,317,000
Vesting of restricted stock units and release of deferred stock units (in shares)			146,000
Vesting of restricted stock units and release of deferred stock units	0		$ 1,000	(1,000)
Withholding tax payments related to net issuance of restricted stock units (in shares)			(37,000)
Withholding tax payments related to net issuance of restricted stock units	(1,637,000)			(1,637,000)
Stock-based compensation	11,922,000			11,922,000
Issuance of shares related to non-compete agreement (in shares)			44,000
Issuance of shares related to non-compete agreement	2,000,000			2,000,000
Dividends declared	$ (13,832,000)				(13,832,000)
Treasury stock repurchases and retirements (in shares)	(700,000)		(688,000)
Treasury stock repurchases and retirements	$ (25,000,000)		$ (5,000)	(1,260,000)	(23,735,000)
Net income	17,583,000				17,583,000
Other comprehensive income (loss)	(414,000)						(414,000)
Ending balance (in shares) at May. 31, 2019			44,723,000
Ending balance at May. 31, 2019	$ 315,347,000		$ 448,000	281,745,000	61,744,000		(28,590,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201609Member
Beginning balance (in shares) at Feb. 28, 2019			44,474,000
Beginning balance at Feb. 28, 2019	$ 306,702,000		$ 446,000	272,408,000	60,462,000		(26,614,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			61,000
Issuance of stock under employee stock purchase plan	1,806,000		$ 1,000	1,805,000
Exercise of stock options (in shares)			35,000
Exercise of stock options	1,049,000			1,049,000
Vesting of restricted stock units and release of deferred stock units (in shares)			146,000
Vesting of restricted stock units and release of deferred stock units	0		$ 1,000	(1,000)
Withholding tax payments related to net issuance of restricted stock units (in shares)			(37,000)
Withholding tax payments related to net issuance of restricted stock units	(1,632,000)			(1,632,000)
Stock-based compensation	6,116,000			6,116,000
Issuance of shares related to non-compete agreement (in shares)			44,000
Issuance of shares related to non-compete agreement	2,000,000			2,000,000
Dividends declared	$ (6,899,000)				(6,899,000)
Treasury stock repurchases and retirements (in shares)	0
Treasury stock repurchases and retirements	$ 0
Net income	8,181,000				8,181,000
Other comprehensive income (loss)	(1,976,000)						(1,976,000)
Ending balance (in shares) at May. 31, 2019			44,723,000
Ending balance at May. 31, 2019	$ 315,347,000		$ 448,000	281,745,000	61,744,000		(28,590,000)
Beginning balance (in shares) at Nov. 30, 2019	45,036,441		45,037,000
Beginning balance at Nov. 30, 2019	$ 330,282,000		$ 450,000	295,503,000	64,303,000		(29,974,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			124,000
Issuance of stock under employee stock purchase plan	3,513,000		$ 1,000	3,512,000
Exercise of stock options (in shares)			113,000
Exercise of stock options	3,528,000		$ 1,000	3,527,000
Vesting of restricted stock units and release of deferred stock units (in shares)			185,000
Vesting of restricted stock units and release of deferred stock units	0		$ 2,000	(2,000)
Withholding tax payments related to net issuance of restricted stock units	(3,895,000)			(3,895,000)
Stock-based compensation	11,674,000			11,674,000
Dividends declared	$ (14,955,000)				(14,955,000)
Treasury stock repurchases and retirements (in shares)	(400,000)		(426,000)
Treasury stock repurchases and retirements	$ (20,000,000)		$ (4,000)	(6,487,000)	(13,509,000)
Net income	38,084,000				38,084,000
Other comprehensive income (loss)	$ (8,270,000)						(8,270,000)
Ending balance (in shares) at May. 31, 2020	45,033,417		45,033,000
Ending balance at May. 31, 2020	$ 339,961,000		$ 450,000	303,832,000	73,923,000		(38,244,000)
Beginning balance (in shares) at Feb. 29, 2020			44,769,000
Beginning balance at Feb. 29, 2020	327,957,000		$ 448,000	296,251,000	64,475,000		(33,217,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			85,000
Issuance of stock under employee stock purchase plan	2,319,000		$ 1,000	2,318,000
Exercise of stock options (in shares)			51,000
Exercise of stock options	1,587,000			1,587,000
Vesting of restricted stock units and release of deferred stock units (in shares)			128,000
Vesting of restricted stock units and release of deferred stock units	0		$ 1,000	(1,000)
Withholding tax payments related to net issuance of restricted stock units	(1,946,000)			(1,946,000)
Stock-based compensation	5,623,000			5,623,000
Dividends declared	$ (7,520,000)				(7,520,000)
Treasury stock repurchases and retirements (in shares)	0
Treasury stock repurchases and retirements	$ 0
Net income	16,968,000				16,968,000
Other comprehensive income (loss)	$ (5,027,000)						(5,027,000)
Ending balance (in shares) at May. 31, 2020	45,033,417		45,033,000
Ending balance at May. 31, 2020	$ 339,961,000		$ 450,000	$ 303,832,000	$ 73,923,000		$ (38,244,000)