Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance, beginning of year, shares at Nov. 30, 2013		51,513,000
Balance, beginning of year at Nov. 30, 2013	$ 513,654	$ 515	$ 204,792	$ 320,006	$ (11,659)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		203,000
Issuance of stock under employee stock purchase plan	3,613	$ 2	3,611
Exercise of stock options, shares		690,000
Exercise of stock options	12,820	$ 7	12,813
Vesting of restricted stock units and release of deferred stock units, shares		866,000
Vesting of restricted stock units and release of deferred stock units	9	$ 9
Withholding tax payments related to net issuance of restricted stock units, shares		(289,000)
Withholding tax payments related to net issuance of restricted stock units	(6,607)	$ (3)	(6,604)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	96	$ 0	96
Stock-based compensation	24,873		24,873
Dividends declared	0
Treasury stock repurchases and retirements, shares		(2,306,000)
Treasury stock repurchases and retirements	(52,604)	$ (23)	(30,310)	(22,271)
Net income	49,458			49,458
Other comprehensive loss	(2,067)				(2,067)
Balance, end of year, shares at Nov. 30, 2014		50,677,000
Balance, end of year at Nov. 30, 2014	543,245	$ 507	209,271	347,193	(13,726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		226,000
Issuance of stock under employee stock purchase plan	4,431	$ 2	4,429
Exercise of stock options, shares		449,000
Exercise of stock options	8,369	$ 4	8,365
Vesting of restricted stock units and release of deferred stock units, shares		714,000
Vesting of restricted stock units and release of deferred stock units	7	$ 7
Withholding tax payments related to net issuance of restricted stock units, shares		(215,000)
Withholding tax payments related to net issuance of restricted stock units	(5,631)	$ (3)	(5,628)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	610	$ 2	608
Stock-based compensation	24,004		24,004
Dividends declared	0
Treasury stock repurchases and retirements, shares		(1,271,000)
Treasury stock repurchases and retirements	(32,868)	$ (13)	(13,625)	(19,230)
Net income	(8,801)			(8,801)
Other comprehensive loss	$ (10,902)				(10,902)
Balance, end of year, shares at Nov. 30, 2015	50,579,539	50,580,000
Balance, end of year at Nov. 30, 2015	$ 522,464	$ 506	227,424	319,162	(24,628)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		266,000
Issuance of stock under employee stock purchase plan	5,328	$ 3	5,325
Exercise of stock options, shares		260,000
Exercise of stock options	4,698	$ 2	4,696
Vesting of restricted stock units and release of deferred stock units, shares		700,000
Vesting of restricted stock units and release of deferred stock units	7	$ 7
Withholding tax payments related to net issuance of restricted stock units, shares		(156,000)
Withholding tax payments related to net issuance of restricted stock units	(3,984)	$ (2)	(3,982)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	489	$ 0	489
Stock-based compensation	22,541		22,541
Dividends declared	(6,067)			(6,067)
Treasury stock repurchases and retirements, shares		(3,113,000)
Treasury stock repurchases and retirements	(79,188)	$ (31)	(17,482)	(61,675)
Net income	(55,726)			(55,726)
Other comprehensive loss	$ (3,933)				(3,933)
Balance, end of year, shares at Nov. 30, 2016	48,536,516	48,537,000
Balance, end of year at Nov. 30, 2016	$ 406,629	$ 485	$ 239,011	$ 195,694	$ (28,561)