Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Interest rate swaps	Foreign currency swaps and contracts	Common stock	Paid in capital	Accumulated other comprehensive loss	Accumulated other comprehensive loss Interest rate swaps	Accumulated other comprehensive loss Foreign currency swaps and contracts	Retained earnings
Balance at Feb. 28, 2010				$ 3,057	$ 120,761	$ (8,574)			$ 468,528
Balance (in shares) at Feb. 28, 2010				30,572,000
Increase (Decrease) in Stockholders' Equity
Adjustments to paid in capital for changes in uncertain tax positions					162
Share-based compensation, net of tax benefits of $74, $99 and $99					1,918
Exercise of stock options, including tax benefits of $5,015, $4,483 and $551				32	7,183
Exercise of stock options, including tax benefits (in shares)				318,000
Issuance of restricted stock				1	(1)
Issuance of restricted stock (in shares)				12,000
Issuance of common stock in connection with employee stock purchase plan				3	475
Issuance of common stock in connection with employee stock purchase plan (in shares)				25,000
Cash flow hedge activity, net of tax		1,582	(1,206)				1,582	(1,206)
Auction rate security activity, net of tax	348					348
Net Income	93,305								93,305
Common stock repurchased and retired				(9)	(483)				(1,533)
Common stock repurchased and retired (in shares)				(88,000)
Balance at Feb. 28, 2011	685,549			3,084	130,015	(7,850)			560,300
Balance (in shares) at Feb. 28, 2011				30,839,000
Increase (Decrease) in Stockholders' Equity
Adjustments to paid in capital for changes in uncertain tax positions					(482)
Share-based compensation, net of tax benefits of $74, $99 and $99					2,829
Exercise of stock options, including tax benefits of $5,015, $4,483 and $551				191	35,066
Exercise of stock options, including tax benefits (in shares)				1,907,000
Issuance of restricted stock				2	(2)
Issuance of restricted stock (in shares)				18,000
Issuance of common stock in connection with employee stock purchase plan				4	1,008
Issuance of common stock in connection with employee stock purchase plan (in shares)				42,000
Cash flow hedge activity, net of tax		792	585				792	585
Auction rate security activity, net of tax	884					884
Net Income	110,374								110,374
Common stock repurchased and retired				(113)	(17,428)				(22,530)
Common stock repurchased and retired (in shares)				(1,125,000)
Balance at Feb. 29, 2012	796,729			3,168	151,006	(5,589)			648,144
Balance (in shares) at Feb. 29, 2012				31,681,000
Increase (Decrease) in Stockholders' Equity
Share-based compensation, net of tax benefits of $74, $99 and $99					2,993
Exercise of stock options, including tax benefits of $5,015, $4,483 and $551				25	10,804
Exercise of stock options, including tax benefits (in shares)				248,000
Issuance of restricted stock				1	(1)
Issuance of restricted stock (in shares)				11,000
Issuance of common stock in connection with employee stock purchase plan				4	1,056
Issuance of common stock in connection with employee stock purchase plan (in shares)				39,000
Cash flow hedge activity, net of tax		2,424	436				2,424	436
Net Income	115,666								115,666
Common stock repurchased and retired				(11)	(1,387)				(2,133)
Common stock repurchased and retired (in shares)				(111,000)
Balance at Feb. 28, 2013	$ 926,606			$ 3,187	$ 164,471	$ (2,729)			$ 761,677
Balance (in shares) at Feb. 28, 2013				31,868,000