Consolidated Condensed Statements of Income (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Consolidated Condensed Statements of Income
Sales revenue, net	$ 319,949,000	$ 319,387,000	$ 631,727,000	$ 623,903,000
Cost of goods sold	186,205,000	196,132,000	378,463,000	380,484,000
Gross profit	133,744,000	123,255,000	253,264,000	243,419,000
Selling, general and administrative expense	109,141,000	92,899,000	196,538,000	180,389,000
Asset impairment charges			9,000,000.0000	12,049,000.0000
Operating income	24,603,000	30,356,000	47,726,000	50,981,000
Nonoperating income (expense), net	97,000	56,000	147,000	140,000
Interest expense	(3,998,000)	(2,192,000)	(7,415,000)	(5,134,000)
Income before income taxes	20,702,000	28,220,000	40,458,000	45,987,000
Income tax expense:
Current	2,888,000	9,973,000	4,927,000	13,869,000
Deferred	(1,025,000)	(5,071,000)	294,000	(5,591,000)
Net income	$ 18,839,000	$ 23,318,000	$ 35,237,000	$ 37,709,000
Earnings per share:
Basic (in dollars per share)	$ 0.66	$ 0.73	$ 1.23	$ 1.18
Diluted (in dollars per share)	$ 0.65	$ 0.72	$ 1.21	$ 1.17
Weighted average shares of common stock used in computing net earnings per share:
Basic (in shares)	28,372	31,993	28,738	31,951
Diluted (in shares)	28,769	32,272	29,192	32,226