CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 482,460	$ 485,944	$ 692,177	$ 660,337
Cost of sales	257,343	269,519	376,435	367,660
Gross profit	225,117	216,425	315,742	292,677
Selling, general and administrative expenses	157,762	162,402	304,643	316,973
Income (loss) from operations	67,355	54,023	11,099	(24,296)
Other expense (income), net:
Interest income	(509)	(103)	(961)	(307)
Interest expense	1,531	1,943	2,538	3,378
Other expense (income), net	12	(289)	(212)	(958)
Total other expense, net	1,034	1,551	1,365	2,113
Income (loss) before income taxes	66,321	52,472	9,734	(26,409)
Income tax expense (benefit)	16,762	13,167	2,296	(6,796)
Net income (loss)	49,559	39,305	7,438	(19,613)
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on foreign currency exchange rate hedges	(911)	(890)	(4,683)	2,019
Foreign currency translation adjustment	2,968	(856)	4,518	2,843
Total other comprehensive income (loss)	2,057	(1,746)	(165)	4,862
Comprehensive income (loss)	$ 51,616	$ 37,559	$ 7,273	$ (14,751)
Net income (loss) per share:
Basic (in dollars per share)	$ 1.55	$ 1.23	$ 0.23	$ (0.61)
Diluted (in dollars per share)	$ 1.54	$ 1.21	$ 0.23	$ (0.61)
Weighted-average common shares outstanding:
Basic (in shares)	32,015	32,057	32,003	32,041
Diluted (in shares)	32,272	32,422	32,256	32,041