Consolidated Statement of Shareholders' Equity - Q Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (shares) at Feb. 28, 2017		25,964
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)		0
Restricted Stock Units (shares)		42
Stock Compensation	1,194	$ 0	1,194
Restricted Stock Units	(1,198)	$ 42	(1,240)
Employee Stock Purchase Plan (shares)		35
Employee Stock Purchase Plan	1,632	$ 35	1,597
Treasury Stock, Shares, Retired		(47)
Treasury Stock, Retired, Par Value Method, Amount	(2,683)	$ 47	2,636
Cash Dividend Paid	(4,423)			(4,423)
Net income (loss)	12,062			12,062
Foreign Currency Translation	(997)				(997)
Interest rate swap	(14)				(14)
Balance (shares) at May. 31, 2017		25,994
Balance at May. 31, 2017	538,709	$ 25,994	36,654	506,166	(30,105)
Balance (shares) at Feb. 28, 2017		25,964
Balance at Feb. 28, 2017	533,136	$ 25,964	37,739	498,527	(29,094)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	21,682
Foreign Currency Translation	2,876
Interest rate swap	(41)
Balance (shares) at Nov. 30, 2017		25,954
Balance at Nov. 30, 2017	543,776	$ 25,954	37,138	506,943	(26,259)
Balance (shares) at May. 31, 2017		25,994
Balance at May. 31, 2017	538,709	$ 25,994	36,654	506,166	(30,105)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Compensation (shares)		16
Stock Compensation	2,206	$ 16	2,190
Stock Issued For Stock Appreciation Rights	0	$ 1	(1)
Stock Issued for Stock Appreciation Rights Shares		1
Treasury Stock, Shares, Retired		(50)
Treasury Stock, Retired, Par Value Method, Amount	(2,502)	$ 50	2,452
Cash Dividend Paid	(4,422)			(4,422)
Net income (loss)	9,786			9,786
Foreign Currency Translation	5,325				5,325
Interest rate swap	(13)				(13)
Balance (shares) at Aug. 31, 2017		25,961
Balance at Aug. 31, 2017	549,089	$ 25,961	36,391	511,530	(24,793)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Compensation (shares)		0
Restricted Stock Units (shares)		1
Stock Compensation	1,410	$ 0	1,410
Restricted Stock Units	(18)	1	(19)
Stock Issued For Stock Appreciation Rights	(4)	$ 0	(4)
Employee Stock Purchase Plan (shares)		42
Stock Issued for Stock Appreciation Rights Shares		0
Employee Stock Purchase Plan	1,685	$ 42	1,643
Treasury Stock, Shares, Retired		(50)
Treasury Stock, Retired, Par Value Method, Amount	(2,333)	$ 50	2,283
Cash Dividend Paid	(4,421)			(4,421)
Net income (loss)	(166)			(166)
Foreign Currency Translation	(1,453)				(1,453)
Interest rate swap	(13)				(13)
Balance (shares) at Nov. 30, 2017		25,954
Balance at Nov. 30, 2017	543,776	$ 25,954	37,138	506,943	(26,259)
Balance (shares) at Feb. 28, 2018		25,959
Balance at Feb. 28, 2018	565,203	$ 25,959	38,446	526,018	(25,220)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Compensation (shares)		0
Restricted Stock Units (shares)		30
Stock Compensation	1,358	$ 0	1,358
Restricted Stock Units	(519)	30	(549)
Stock Issued For Stock Appreciation Rights	1	$ 1	0
Employee Stock Purchase Plan (shares)		37
Stock Issued for Stock Appreciation Rights Shares		1
Employee Stock Purchase Plan	1,327	$ 37	1,290
Cash Dividend Paid	(4,418)			(4,418)
Net income (loss)	15,718			15,718
Foreign Currency Translation	(2,256)				(2,256)
Interest rate swap	(14)				(14)
Balance (shares) at May. 31, 2018		26,027
Balance at May. 31, 2018	576,400	$ 26,027	40,545	537,318	(27,490)
Balance (shares) at Feb. 28, 2018		25,959
Balance at Feb. 28, 2018	565,203	$ 25,959	38,446	526,018	(25,220)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	42,357
Foreign Currency Translation	(3,988)
Interest rate swap	(41)
Balance (shares) at Nov. 30, 2018		26,087
Balance at Nov. 30, 2018	595,878	$ 26,087	43,944	555,096	(29,249)
Balance (shares) at May. 31, 2018		26,027
Balance at May. 31, 2018	576,400	$ 26,027	40,545	537,318	(27,490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Compensation (shares)		15
Restricted Stock Units (shares)		0
Stock Compensation	2,301	$ 15	2,286
Restricted Stock Units	(14)	0	(14)
Stock Issued For Stock Appreciation Rights	(22)	$ 8	(30)
Stock Issued for Stock Appreciation Rights Shares		8
Cash Dividend Paid	(4,426)			(4,426)
Net income (loss)	11,244			11,244
Foreign Currency Translation	455				455
Interest rate swap	(13)				(13)
Balance (shares) at Aug. 31, 2018		26,050
Balance at Aug. 31, 2018	585,925	$ 26,050	42,787	544,136	(27,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Compensation (shares)		0
Stock Compensation	(324)	$ 0	(324)
Employee Stock Purchase Plan (shares)		37
Employee Stock Purchase Plan	1,518	$ 37	1,481
Cash Dividend Paid	(4,435)			(4,435)
Net income (loss)	15,395			15,395
Foreign Currency Translation	(2,187)				(2,187)
Interest rate swap	(14)				(14)
Balance (shares) at Nov. 30, 2018		26,087
Balance at Nov. 30, 2018	$ 595,878	$ 26,087	$ 43,944	$ 555,096	$ (29,249)