Consolidated Statement of Shareholders' Equity (Unaudited) (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance, beginning balance at Feb. 28, 2011	$ 256,017,873	$ 25,218,320	$ 11,531,862	$ 218,889,963	$ 920,063	$ (542,335)
Balance, beginning balance (shares) at Feb. 28, 2011		25,218,320
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	48		8,150			(8,102)
Stock compensation	2,927,917		2,893,345			34,572
Restricted Stock Units	(77,997)		(90,996)			12,999
Stock Issued for SARs	(775,680)		(981,519)			205,839
Employee Stock Purchase Plan	(763,291)		(640,542)			122,749
Federal income tax deducted on stock options	199,427		199,427
Cash dividend paid	12,565,821			12,565,821
Net income	40,735,796			40,735,796
Foreign currency translation	438,148				438,148
Interest rate swap, net of $29,205 of income tax	(54,237)				(54,237)
Balance, ending balance at Feb. 29, 2012	287,608,765	25,218,320	14,200,811	247,059,938	1,303,974	(174,278)
Balance, beginning balance (shares) at Feb. 29, 2012		25,218,320
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)		7,488
Exercise of stock options	15,781	7,488	8,293
Stock compensation (shares)		14,000
Stock compensation	3,175,050	14,000	3,161,050
Restricted Stock Units	(413,379)		(516,916)			103,537
Stock Issued for SARs, Shares		89,662
Stock Issued for SARs	(1,191,919)	89,662	(1,296,943)			15,362
Employee Stock Purchase Plan (shares)		47,497
Employee Stock Purchase Plan	(917,253)	47,497	(814,377)			55,379
Federal income tax deducted on stock options	1,283,240		(1,283,240)
Cash dividend paid	13,423,199			13,423,199
Net income	60,456,206			60,456,206
Foreign currency translation	(4,439,087)				(4,439,087)
Interest rate swap, net of $29,205 of income tax	(54,237)				(54,237)
Balance, ending balance at Feb. 28, 2013	333,934,474	25,376,967	17,653,912	294,092,945	(3,189,350)	0
Balance, ending balance (shares) at Feb. 28, 2013		25,376,967
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation (shares)		14,000
Stock compensation	3,703,407	14,000	3,689,407
Restricted Stock Units	(1,337,869)	55,518	(1,393,387)
Stock Issued for SARs, Shares		67,771
Stock Issued for SARs	(1,048,872)	67,771	(1,116,643)
Employee Stock Purchase Plan (shares)		62,949
Employee Stock Purchase Plan	1,582,446	62,949	1,519,497
Federal income tax deducted on stock options	1,601,991		1,601,991
Cash dividend paid	(14,290,437)			(14,290,437)
Net income	59,597,048			59,597,048
Foreign currency translation	(7,774,689)				(7,774,689)
Interest rate swap, net of $29,205 of income tax	(54,237)				(54,237)
Balance, ending balance at Feb. 28, 2014	$ 375,913,262	$ 25,577,205	$ 21,954,777	$ 339,399,556	$ (11,018,276)	$ 0
Balance, ending balance (shares) at Feb. 28, 2014		25,577,205