Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	May. 31, 2015		Nov. 30, 2014	May. 31, 2014
Beginning Balance	$ 1,288,338	[1]		$ 1,551,165
Net income	48,086			37,745
Other comprehensive income (loss), net of tax	(5,983)			(899)
Exercise of common stock options	2,109			45
Common stock repurchase				(80,033)
Share-based compensation expense	36,522			28,714
Assumed employee share-based awards from a business acquisition				895
Tax benefits related to share-based awards	5,562			900
Minimum tax withholdings paid by the Company on behalf of employees related to net settlement of employee share-based awards	(25,211)			(13,729)
Ending Balance	1,349,423			1,524,803
Common Stock
Beginning Balance	23			23
Ending Balance	23			23
Additional Paid-in Capital
Beginning Balance	1,963,851			1,891,848
Exercise of common stock options	2,109			45
Common stock repurchase	75,000		$ (75,000)
Share-based compensation expense	36,522			28,714
Assumed employee share-based awards from a business acquisition				895
Tax benefits related to share-based awards	5,562			900
Minimum tax withholdings paid by the Company on behalf of employees related to net settlement of employee share-based awards	(25,211)			(13,729)
Other adjustments	213			261
Ending Balance	2,058,046			1,908,934
Retained Earnings
Beginning Balance	900,373			720,172
Net income	48,086			37,745
Ending Balance	948,459			757,917
Treasury Stock
Beginning Balance	(1,515,288)			(1,056,419)
Common stock repurchase	(75,000)		$ (300,000)	(80,033)
Other adjustments	(213)			(261)
Ending Balance	(1,590,501)			(1,136,713)
Accumulated Other Comprehensive Income (Loss)
Beginning Balance	(60,621)			(4,459)
Other comprehensive income (loss), net of tax	(5,983)			(899)
Ending Balance	$ (66,604)			$ (5,358)

[1] Derived from audited financial statements.