CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,903,339	$ 1,790,147	$ 1,875,197
Cost of sales	971,697	954,912	1,028,529
Gross profit	931,642	835,235	846,668
Selling, general and administrative expenses	709,058	837,154	684,541
Income (loss) from operations	222,584	(1,919)	162,127
Other expense (income):
Interest income	(3,057)	(778)	(420)
Interest expense	4,585	7,319	5,814
Other expense (income), net	360	(1,474)	(152)
Total other expense, net	1,888	5,067	5,242
Income (loss) before income taxes	220,696	(6,986)	156,885
Income tax expense (benefit)	106,302	(12,696)	34,620
Net income	114,394	5,710	122,265
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on foreign currency exchange rate hedges	(613)	704	461
Foreign currency translation gain (loss)	14,081	(6,598)	(550)
Total other comprehensive income (loss)	13,468	(5,894)	(89)
Comprehensive income (loss)	$ 127,862	$ (184)	$ 122,176
Net income per share:
Basic (in dollars per share)	$ 3.60	$ 0.18	$ 3.76
Diluted (in dollars per share)	$ 3.58	$ 0.18	$ 3.70
Weighted-average common shares outstanding:
Basic (in shares)	31,758	32,000	32,556
Diluted (in shares)	31,996	32,355	33,039