CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 760,345	$ 795,902	$ 1,420,682	$ 1,496,562
Cost of sales	376,711	404,885	744,371	804,836
Gross profit	383,634	391,017	676,311	691,726
Selling, general and administrative expenses	330,384	188,517	647,357	501,721
Income from operations	53,250	202,500	28,954	190,005
Other expense (income), net:
Interest income	(169)	(49)	(476)	(230)
Interest expense	2,660	2,075	6,038	4,642
Other income, net	(128)	(184)	(1,086)	(225)
Total other expense, net	2,363	1,842	4,476	4,187
Income before income taxes	50,887	200,658	24,478	185,818
Income tax expense	9,860	43,737	3,064	39,847
Net income	41,027	156,921	21,414	145,971
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on foreign currency hedging	(1,399)	1,417	620	981
Foreign currency translation adjustment	(13,067)	(3,568)	(10,224)	(1,893)
Total other comprehensive loss	(14,466)	(2,151)	(9,604)	(912)
Comprehensive income	$ 26,561	$ 154,770	$ 11,810	$ 145,059
Net income per share:
Basic (in USD per share)	$ 1.28	$ 4.85	$ 0.67	$ 4.47
Diluted (in USD per share)	$ 1.27	$ 4.78	$ 0.66	$ 4.40
Weighted-average common shares outstanding:
Basic (in shares)	31,973	32,341	32,018	32,655
Diluted (in shares)	32,309	32,843	32,377	33,157