CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 623,525	$ 542,205	$ 906,694	$ 819,044
Cost of sales	304,548	269,181	445,151	416,001
Gross profit	318,977	273,024	461,543	403,043
Selling, general and administrative expenses	190,373	175,893	340,638	337,329
Income from operations	128,604	97,131	120,905	65,714
Interest income	(452)	(1,530)	(1,126)	(4,396)
Interest expense	1,205	1,524	2,395	2,670
Other income, net	(113)	(86)	(256)	(178)
Total other expense (income), net	640	(92)	1,013	(1,904)
Income before income taxes	127,964	97,223	119,892	67,618
Income tax expense	26,410	19,413	26,311	9,159
Net income	101,554	77,810	93,581	58,459
Other comprehensive income (loss)
Unrealized (loss) gain on cash flow hedges, net of tax	(800)	1,497	(447)	1,180
Foreign currency translation gain (loss)	6,395	(3,391)	7,048	(3,323)
Total other comprehensive income (loss)	5,595	(1,894)	6,601	(2,143)
Comprehensive income	$ 107,149	$ 75,916	$ 100,182	$ 56,316
Net income per share
Basic (in dollars per share)	$ 3.62	$ 2.73	$ 3.34	$ 2.03
Diluted (in dollars per share)	$ 3.58	$ 2.71	$ 3.30	$ 2.01
Weighted-average common shares outstanding
Basic (in shares)	28,046	28,483	28,024	28,785
Diluted (in shares)	28,335	28,705	28,314	29,039