Condensed Consolidated Statements of Shareholders’ Equity - USD ($) $ in Thousands		Total		Common Stock		Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Nov. 30, 2017	[1]			47,281,000
Beginning balance at Nov. 30, 2017	[1]	$ 411,349		$ 473		$ 249,363	$ 179,919	$ (18,406)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)				179,000
Issuance of stock under employee stock purchase plan		4,282		$ 2		4,280
Exercise of stock options (in shares)				162,000
Exercise of stock options		3,558		$ 2		3,556
Withholding tax payments related to net issuance of restricted stock units (in shares)				148,000
Withholding tax payments related to net issuance of restricted stock units		(1,941)		$ 1		(1,942)
Stock-based compensation		14,716				14,716
Dividends declared		$ (19,175)					(19,175)
Treasury stock repurchases and retirements (in shares)		(2,600,000)		(2,637,000)
Treasury stock repurchases and retirements		$ (110,000)		$ (26)		(7,811)	(102,163)
Net income		41,026	[2],[3]				41,026
Other comprehensive income (loss)		(7,113)						(7,113)
Ending balance (in shares) at Aug. 31, 2018	[1]			45,133,000
Ending balance at Aug. 31, 2018	[1]	336,702		$ 452		262,803	98,966	(25,519)
Beginning balance (in shares) at May. 31, 2018				45,503,000
Beginning balance at May. 31, 2018		342,726	[1]	$ 456		258,244	107,647	(23,621)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)				114,000
Issuance of stock under employee stock purchase plan		1,213		$ (1)		1,214
Exercise of stock options (in shares)				109,000
Exercise of stock options		2,033		$ 1		2,032
Withholding tax payments related to net issuance of restricted stock units (in shares)				148,000
Withholding tax payments related to net issuance of restricted stock units		(10)		$ 1		(11)
Stock-based compensation		4,566				4,566
Dividends declared		$ (6,318)					(6,318)
Treasury stock repurchases and retirements (in shares)		(500,000)		(513,000)
Treasury stock repurchases and retirements		$ (20,000)		$ (5)		(3,242)	(16,753)
Net income		14,390	[3]				14,390
Other comprehensive income (loss)		(1,898)						(1,898)
Ending balance (in shares) at Aug. 31, 2018	[1]			45,133,000
Ending balance at Aug. 31, 2018	[1]	$ 336,702		$ 452		262,803	98,966	(25,519)
Beginning balance (in shares) at Nov. 30, 2018		45,114,935		45,115,000	[1]
Beginning balance at Nov. 30, 2018	[1]	$ 324,002	[4]	$ 451		266,602	85,125	(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		44,785,586		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		$ 448		281,745	61,744	(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)
Net income		13,557					13,557
Other comprehensive income (loss)		$ (4,432)						(4,432)
Ending balance (in shares) at Aug. 31, 2019		44,785,586		44,786,000
Ending balance at Aug. 31, 2019		$ 332,952		$ 448		$ 289,040	76,486	$ (33,022)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment due to adoption of ASU | Accounting Standards Update 2016-16							$ (8,200)

[1] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.

[2] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.

[3] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.

[4] 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 Basis of Presentation for further information.