CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 810,478	$ 760,345	$ 1,502,655	$ 1,420,682
Cost of sales	387,007	376,711	763,442	744,371
Gross profit	423,471	383,634	739,213	676,311
Selling, general and administrative expenses	230,280	330,384	534,923	647,357
Income from operations	193,191	53,250	204,290	28,954
Other expense (income), net:
Interest income	(590)	(169)	(1,551)	(476)
Interest expense	1,506	2,660	4,044	6,038
Other income, net	(778)	(128)	(990)	(1,086)
Total other expense, net	138	2,363	1,503	4,476
Income before income taxes	193,053	50,887	202,787	24,478
Income tax expense	106,712	9,860	109,008	3,064
Net income	86,341	41,027	93,779	21,414
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on foreign currency exchange rate hedges	2,509	(1,399)	(2,174)	620
Foreign currency translation adjustment	2,037	(13,067)	6,555	(10,224)
Total other comprehensive income (loss)	4,546	(14,466)	4,381	(9,604)
Comprehensive income	$ 90,887	$ 26,561	$ 98,160	$ 11,810
Net income per share:
Basic (in dollars per share)	$ 2.71	$ 1.28	$ 2.93	$ 0.67
Diluted (in dollars per share)	$ 2.69	$ 1.27	$ 2.91	$ 0.66
Weighted-average common shares outstanding:
Basic (in shares)	31,863	31,973	31,956	32,018
Diluted (in shares)	32,041	32,309	32,186	32,377