CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 2,020,437	$ 1,903,339	$ 1,790,147
Cost of sales	980,187	971,697	954,912
Gross profit	1,040,250	931,642	835,235
Selling, general and administrative expenses	712,930	709,058	837,154
Income (loss) from operations	327,320	222,584	(1,919)
Interest income	(6,028)	(3,057)	(778)
Interest expense	4,661	4,585	7,319
Other (income) expense, net	(247)	360	(1,474)
Total other (income) expense, net	(1,614)	1,888	5,067
Income (loss) before income taxes	328,934	220,696	(6,986)
Income tax expense (benefit)	64,626	106,302	(12,696)
Net income	264,308	114,394	5,710
Other comprehensive (loss) income, net of tax
Unrealized (loss) gain on cash flow hedges	(243)	(613)	704
Foreign currency translation (loss) gain	(9,428)	14,081	(6,598)
Total other comprehensive (loss) income	(9,671)	13,468	(5,894)
Comprehensive income (loss)	$ 254,637	$ 127,862	$ (184)
Net income per share
Basic (in dollars per share)	$ 8.92	$ 3.60	$ 0.18
Diluted (in dollars per share)	$ 8.84	$ 3.58	$ 0.18
Weighted-average common shares outstanding
Basic (in shares)	29,641	31,758	32,000
Diluted (in shares)	29,903	31,996	32,355