CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net sales (Note 2, Note 12, and Note 13)	$ 4,985,612	$ 4,287,763	$ 3,627,286
Cost of sales	2,099,949	1,902,275	1,801,916
Gross profit	2,885,663	2,385,488	1,825,370
Selling, general, and administrative expenses (Note 12)	1,706,571	1,457,974	1,172,619
Income from operations (Note 12)	1,179,092	927,514	652,751
Interest income	(68,389)	(52,208)	(15,563)
Interest expense	3,517	2,564	3,442
Other expense (income), net	665	(1,783)	(1,210)
Total other income, net	(64,207)	(51,427)	(13,331)
Income before income taxes	1,243,299	978,941	666,082
Income tax expense (Note 5)	277,208	219,378	149,260
Net income	966,091	759,563	516,822
Other comprehensive income (loss), net of tax
Unrealized gain on cash flow hedges	1,584	0	0
Foreign currency translation loss	(505)	(11,698)	(14,080)
Total other comprehensive income (loss), net of tax	1,079	(11,698)	(14,080)
Comprehensive income	$ 967,170	$ 747,865	$ 502,742
Net income per share
Basic (in dollars per share)	$ 6.36	$ 4.89	$ 3.25
Diluted (in dollars per share)	$ 6.33	$ 4.86	$ 3.23
Weighted-average common shares outstanding (Note 11)
Basic (in shares)	151,992	155,225	159,023
Diluted (in shares)	152,670	156,285	160,111