Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance (in shares) at Feb. 28, 2019		24,946,000
Beginning balance at Feb. 28, 2019	$ 996,637	$ 2,495	$ 246,585	$ 1,191	$ 746,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,694				40,694
Other comprehensive income, net of tax	(3,202)			(3,202)
Exercise of stock options (in shares)		35,000
Exercise of stock options	1,826	$ 4	1,822
Net issuance and settlement of restricted stock (in shares)		173,000
Net issuance and settlement of restricted stock	0	$ 17	(17)
Issuance of common stock related to stock purchase plan (in shares)		15,000
Issuance of common stock related to stock purchase plan	1,408	$ 1	1,407
Common stock repurchased and retired (in shares)		(68,000)
Common stock repurchased and retired	(8,788)	$ (7)	(8,322)		(459)
Share-based compensation	7,604		7,604
Ending balance (in shares) at May. 31, 2019		25,101,000
Ending balance at May. 31, 2019	1,036,179	$ 2,510	249,079	(2,011)	786,601
Beginning balance (in shares) at Feb. 29, 2020		25,194,000
Beginning balance at Feb. 29, 2020	1,161,723	$ 2,519	268,043	(7,005)	898,166
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	60,286				60,286
Other comprehensive income, net of tax	$ (1,912)			(1,912)
Exercise of stock options (in shares)	8,440	8,000
Exercise of stock options	$ 476	$ 1	475
Net issuance and settlement of restricted stock (in shares)		165,000
Net issuance and settlement of restricted stock	0	$ 17	(17)
Issuance of common stock related to stock purchase plan (in shares)		15,000
Issuance of common stock related to stock purchase plan	1,901	$ 1	1,900
Common stock repurchased and retired (in shares)		(61,000)
Common stock repurchased and retired	(10,013)	$ (6)	(9,895)		(112)
Share-based compensation	9,291		9,291
Ending balance (in shares) at May. 31, 2020		25,321,000
Ending balance at May. 31, 2020	$ 1,221,752	$ 2,532	$ 269,797	$ (8,917)	$ 958,340