CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 1,077,759	$ 938,735	$ 1,984,453	$ 1,757,779
Cost of sales	463,862	431,103	909,013	847,104
Gross profit	613,897	507,632	1,075,440	910,675
Selling, general, and administrative expenses	285,242	251,866	625,880	589,195
Income from operations	328,655	255,766	449,560	321,480
Interest income	(593)	(848)	(1,719)	(5,244)
Interest expense	959	128	3,354	2,798
Other income, net	(267)	(117)	(523)	(295)
Total other expense (income), net	99	(837)	1,112	(2,741)
Income before income taxes	328,556	256,603	448,448	324,221
Income tax expense	73,020	55,010	99,331	64,169
Net income	255,536	201,593	349,117	260,052
Other comprehensive income (loss)
Unrealized (loss) gain on cash flow hedges, net of tax	(279)	(973)	(726)	207
Foreign currency translation gain (loss)	7,947	2,667	14,995	(656)
Total other comprehensive income (loss)	7,668	1,694	14,269	(449)
Comprehensive income	$ 263,204	$ 203,287	$ 363,386	$ 259,603
Net income per share
Basic (in dollars per share)	$ 9.09	$ 7.21	$ 12.44	$ 9.12
Diluted (in dollars per share)	$ 8.99	$ 7.14	$ 12.30	$ 9.02
Weighted-average common shares outstanding
Basic (in shares)	28,114	27,978	28,054	28,515
Diluted (in shares)	28,410	28,249	28,375	28,832