Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, beginning balance (shares) at Feb. 28, 2015		25,732
Balance, beginning balance at Feb. 28, 2015	$ 424,452	$ 25,732	$ 27,706	$ 393,846	$ (22,832)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation (shares)		15
Share-based compensation	4,538	$ 15	4,523
Stock Issued During Period, Shares, Restricted Stock Award, Gross		17
Restricted Stock Units	(373)	$ 17	(390)
Stock Issued for SARs, Shares		41
Stock Issued for SARs	(91)	$ 41	(132)
Employee Stock Purchase Plan (shares)		69
Employee Stock Purchase Plan	2,485	$ 69	2,416
Retirement of treasury shares	(1,025)		(1,025)
Cash dividend paid	(15,482)			(15,482)
Net income	75,544			75,544	0
Foreign currency translation	(7,674)				(7,674)
Interest rate swap, net of $29,205 of income tax	(54)				(54)
Balance, ending balance (shares) at Feb. 29, 2016		25,874
Balance, ending balance at Feb. 29, 2016	484,370	$ 25,874	35,148	453,908	(30,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation (shares)		13
Share-based compensation	5,870	$ 13	5,857
Stock Issued During Period, Shares, Restricted Stock Award, Gross		25
Restricted Stock Units	(580)	$ 25	(605)
Stock Issued for SARs, Shares		81
Stock Issued for SARs	(241)	$ 81	(322)
Employee Stock Purchase Plan (shares)		71
Employee Stock Purchase Plan	2,914	$ 71	2,843
Retirement of treasury shares	(5,282)		(5,182)	0
Cash dividend paid	(16,645)			(16,645)
Net income	61,264			61,264	0
Foreign currency translation	1,520				1,520
Interest rate swap, net of $29,205 of income tax	(54)				(54)
Balance, ending balance (shares) at Feb. 28, 2017		25,964
Balance, ending balance at Feb. 28, 2017	533,136	$ 25,964	37,739	498,527	(29,094)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation (shares)		16
Share-based compensation	6,121	$ 16	6,105
Stock Issued During Period, Shares, Restricted Stock Award, Gross		43
Restricted Stock Units	(1,213)	$ 43	(1,256)
Stock Issued for SARs, Shares		6
Stock Issued for SARs	(5)	$ 6	(11)
Employee Stock Purchase Plan (shares)		77
Employee Stock Purchase Plan	3,317	$ 77	3,240
Stock Repurchased and Retired During Period, Shares		(147)
Stock Repurchased and Retired During Period, Value	(7,518)	$ (147)	(7,371)
Cash dividend paid	(17,678)			(17,678)
Net income	45,169			45,169
Foreign currency translation	3,928				3,928
Interest rate swap, net of $29,205 of income tax	(54)				(54)
Balance, ending balance (shares) at Feb. 28, 2018		25,959
Balance, ending balance at Feb. 28, 2018	$ 565,203	$ 25,959	$ 38,446	$ 526,018	$ (25,220)