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, 2012		59,595,000
Balance, beginning of year at Nov. 30, 2012	$ 638,399	$ 596	$ 299,737	$ 348,830	$ (10,764)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		281,000
Issuance of stock under employee stock purchase plan	4,298	$ 3	4,295
Exercise of stock options, shares		2,722,000
Exercise of stock options	50,466	$ 27	50,439
Vesting of restricted stock units, shares		697,000
Vesting of restricted stock units	7	$ 7
Withholding tax payments related to net issuance of restricted stock units, shares		(203,000)
Withholding tax payments related to net issuance of restricted stock units	(4,938)	$ (2)	(4,936)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	(520)	$ 0	(520)
Stock-based compensation	$ 21,399		21,399
Treasury stock repurchases and retirements, shares	(11,579,000)	(11,579,000)
Treasury stock repurchases and retirements	$ (269,469)	$ (116)	(165,622)	(103,731)
Net income	74,907			74,907
Other comprehensive loss	(895)				(895)
Balance, end of year, shares at Nov. 30, 2013		51,513,000
Balance, end 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, shares		866,000
Vesting of restricted 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
Treasury stock repurchases and retirements, shares	(2,306,000)	(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	50,676,769	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, shares		714,000
Vesting of restricted 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
Treasury stock repurchases and retirements, shares	(1,300,000)	(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)