Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 480,273	$ 386,725	$ 691,742	$ 556,810
Cost of sales	256,400	219,833	381,097	320,086
Gross profit	223,873	166,892	310,645	236,724
Selling, general and administrative expenses	164,290	120,395	301,544	232,978
Income from operations	59,583	46,497	9,101	3,746
Other expense (income), net:
Interest income	(30)	(7)	(84)	(16)
Interest expense	2,000	1,067	2,438	1,447
Other, net	(29)	(265)	(125)	(335)
Total other expense (income), net	1,941	795	2,229	1,096
Income before income taxes	57,642	45,702	6,872	2,650
Income tax expense (benefit)	16,912	12,642	3,204	(1,135)
Net income	40,730	33,060	3,668	3,785
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on foreign currency hedging	1,701	(1,772)	1,441	(1,982)
Foreign currency translation adjustment	(4,976)	2,898	(4,500)	1,809
Total other comprehensive (loss) income	(3,275)	1,126	(3,059)	(173)
Comprehensive income	$ 37,455	$ 34,186	$ 609	$ 3,612
Net income per share:
Basic (in dollars per share)	$ 1.18	$ 0.96	$ 0.11	$ 0.11
Diluted (in dollars per share)	$ 1.17	$ 0.95	$ 0.10	$ 0.11
Weighted-average common shares outstanding:
Basic (in shares)	34,632	34,496	34,629	34,474
Diluted (in shares)	34,954	34,794	34,941	34,796