CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 250,594	$ 209,717
Cost of sales	135,629	119,092
Gross profit	114,965	90,625
Selling, general and administrative expenses	154,379	146,881
Loss from operations	(39,414)	(56,256)
Interest income	(1,586)	(452)
Interest expense	1,234	1,007
Other income, net	(11)	(224)
Total other (income) expense, net	(363)	331
Loss before income taxes	(39,051)	(56,587)
Income tax benefit	(8,644)	(14,466)
Net loss	(30,407)	(42,121)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on foreign currency exchange rate hedges	5,323	(3,772)
Foreign currency translation (loss) gain	(7,463)	1,550
Total other comprehensive loss	(2,140)	(2,222)
Comprehensive loss	$ (32,547)	$ (44,343)
Net loss per share
Basic (in dollars per share)	$ (1.00)	$ (1.32)
Diluted (in dollars per share)	$ (1.00)	$ (1.32)
Weighted-average common shares outstanding
Basic (in shares)	30,423	31,991
Diluted (in shares)	30,423	31,991