Condensed Consolidated Statements of Shareholders’ Equity - USD ($) $ in Thousands	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	$ 4,781	$ 451	$ 266,602	$ 85,125	$ 4,781	$ (28,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			141,000
Issuance of stock under employee stock purchase plan	4,045		$ 1	4,044
Exercise of stock options (in shares)			64,000
Exercise of stock options	1,881		$ 1	1,880
Vesting of restricted stock units and release of deferred stock units (in shares)			147,000
Vesting of restricted stock units and release of deferred stock units	0		$ 1	(1)
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)			(1,637)
Stock-based compensation	17,411			17,411
Issuance of shares related to non-compete agreement (in shares)			44,000
Issuance of shares related to non-compete agreement	2,000			2,000
Dividends declared	$ (20,825)				(20,825)
Treasury stock repurchases and retirements (in shares)	(700,000)		(688,000)
Treasury stock repurchases and retirements	$ (25,000)		$ (6)	(1,259)	(23,735)
Net income	31,140				31,140
Other comprehensive income (loss)	(4,846)						(4,846)
Ending balance (in shares) at Aug. 31, 2019			44,786,000
Ending balance at Aug. 31, 2019	332,952		$ 448	289,040	76,486		(33,022)
Beginning balance (in shares) at May. 31, 2019			44,723,000
Beginning balance at May. 31, 2019	315,347	$ 8,178	$ 448	281,745	61,744	$ 8,178	(28,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			42,000
Issuance of stock under employee stock purchase plan	1,242			1,242
Exercise of stock options (in shares)			20,000
Exercise of stock options	563			563
Vesting of restricted stock units and release of deferred stock units (in shares)			1,000
Vesting of restricted stock units and release of deferred stock units	0
Stock-based compensation	5,490			5,490
Dividends declared	$ (6,993)				(6,993)
Treasury stock repurchases and retirements (in shares)	0
Net income	$ 13,557				13,557
Other comprehensive income (loss)	(4,432)						(4,432)
Ending balance (in shares) at Aug. 31, 2019			44,786,000
Ending balance at Aug. 31, 2019	$ 332,952		$ 448	289,040	76,486		(33,022)
Beginning balance (in shares) at Nov. 30, 2019	45,036,441		45,037,000
Beginning balance at Nov. 30, 2019	$ 330,282		$ 450	295,503	64,303		(29,974)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			178,000
Issuance of stock under employee stock purchase plan	4,986		$ 2	4,984
Exercise of stock options (in shares)			115,000
Exercise of stock options	3,607		$ 1	3,606
Vesting of restricted stock units and release of deferred stock units (in shares)			197,000
Vesting of restricted stock units and release of deferred stock units	0		$ 2	(2)
Withholding tax payments related to net issuance of restricted stock units	(4,072)			(4,072)
Stock-based compensation	17,359			17,359
Dividends declared	$ (22,430)				(22,430)
Treasury stock repurchases and retirements (in shares)	(400,000)		(426,000)
Treasury stock repurchases and retirements	$ (20,000)		$ (4)	(6,487)	(13,509)
Net income	62,061				62,061
Other comprehensive income (loss)	$ (3,627)						(3,627)
Ending balance (in shares) at Aug. 31, 2020	45,101,672		45,101,000
Ending balance at Aug. 31, 2020	$ 368,166		$ 451	310,891	90,425		(33,601)
Beginning balance (in shares) at May. 31, 2020			45,033,000
Beginning balance at May. 31, 2020	339,961		$ 450	303,832	73,923		(38,244)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)			54,000
Issuance of stock under employee stock purchase plan	1,473		$ 1	1,472
Exercise of stock options (in shares)			2,000
Exercise of stock options	79		$ 0	79
Vesting of restricted stock units and release of deferred stock units (in shares)			12,000
Vesting of restricted stock units and release of deferred stock units	0
Withholding tax payments related to net issuance of restricted stock units	(177)			(177)
Stock-based compensation	5,685			5,685
Dividends declared	$ (7,475)				(7,475)
Treasury stock repurchases and retirements (in shares)	0
Net income	$ 23,977				23,977
Other comprehensive income (loss)	$ 4,643						4,643
Ending balance (in shares) at Aug. 31, 2020	45,101,672		45,101,000
Ending balance at Aug. 31, 2020	$ 368,166		$ 451	$ 310,891	$ 90,425		$ (33,601)