Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total		Common Stock		Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance, beginning of year (in shares) at Nov. 30, 2016	[1]			48,537,000
Balance, beginning of year at Nov. 30, 2016	[1]	$ 442,729		$ 485		$ 239,011	$ 231,794	$ (28,561)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)				220,000
Issuance of stock under employee stock purchase plan		4,900		$ 2		4,898
Exercise of stock options (in shares)				203,000
Exercise of stock options		5,108		$ 2		5,106
Vesting of restricted stock units and release of deferred stock units (in shares)				660,000
Vesting of restricted stock units and release of deferred stock units		7		$ 7
Withholding tax payments related to net issuance of restricted stock units (in shares)				(118,000)
Withholding tax payments related to net issuance of restricted stock units		(3,756)		$ (1)		(3,755)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity		679				679
Stock-based compensation		14,153				14,153
Dividends declared		$ (24,679)					(24,679)
Treasury stock repurchases and retirements (in shares)		(2,200,000)		(2,221,000)
Treasury stock repurchases and retirements		$ (73,936)		$ (22)		(10,729)	(63,185)
Net income		29,021	[2],[3],[4]				29,021
Other comprehensive income (loss), net of tax		10,155	[4]					10,155
Balance, end of year (in shares) at Nov. 30, 2017	[1]			47,281,000
Balance, end of year at Nov. 30, 2017	[1]	404,381		$ 473		249,363	172,951	(18,406)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)				225,000
Issuance of stock under employee stock purchase plan		5,458		$ 2		5,456
Exercise of stock options (in shares)				189,000
Exercise of stock options		3,858		$ 2		3,856
Vesting of restricted stock units and release of deferred stock units (in shares)				407,000
Vesting of restricted stock units and release of deferred stock units		4		$ 4
Withholding tax payments related to net issuance of restricted stock units (in shares)				(108,000)
Withholding tax payments related to net issuance of restricted stock units		(3,999)		$ (1)		(3,998)
Stock-based compensation		20,569				20,569
Dividends declared		$ (26,169)					(26,169)
Treasury stock repurchases and retirements (in shares)		(2,900,000)		(2,879,000)
Treasury stock repurchases and retirements		$ (120,000)		$ (29)		(9,285)	(110,686)
Net income		49,670	[2],[3],[4]				49,670
Other comprehensive income (loss), net of tax		$ (9,770)	[4]					(9,770)
Balance, end of year (in shares) at Nov. 30, 2018		45,114,935		45,115,000	[1]
Balance, end of year at Nov. 30, 2018	[1]	$ 324,002	[5]	$ 451		266,602	85,125	(28,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan (in shares)				189,000
Issuance of stock under employee stock purchase plan		5,507		$ 2		5,505
Exercise of stock options (in shares)				119,000
Exercise of stock options		3,621		$ 1		3,620
Vesting of restricted stock units and release of deferred stock units (in shares)				364,000
Vesting of restricted stock units and release of deferred stock units		3		$ 4		(1)
Withholding tax payments related to net issuance of restricted stock units (in shares)				(106,000)
Withholding tax payments related to net issuance of restricted stock units		(4,278)		$ (1)		(4,277)
Stock-based compensation		23,311				23,311
Issuance of shares related to non-compete agreement (in shares)				44,000
Issuance of shares related to non-compete agreement (Note 7)		2,000				2,000
Dividends declared		$ (28,267)					(28,267)
Treasury stock repurchases and retirements (in shares)		(700,000)		(688,000)
Treasury stock repurchases and retirements		$ (25,000)		$ (7)		(1,257)	(23,736)
Net income		26,400					26,400
Other comprehensive income (loss), net of tax		$ (1,798)						(1,798)
Balance, end of year (in shares) at Nov. 30, 2019		45,036,441		45,037,000
Balance, end of year at Nov. 30, 2019		$ 330,282		$ 450		$ 295,503	$ 64,303	$ (29,974)

[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.

[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 Summary of Significant Accounting Policies for further information.

[5] 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.