CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Net sales (Note 2 and Note 13)	$ 5,472,296	$ 4,985,612	$ 4,287,763
Cost of sales	2,314,570	2,099,949	1,902,275
Gross profit	3,157,726	2,885,663	2,385,488
Selling, general, and administrative expenses (Note 13)	1,894,823	1,706,571	1,457,974
Income from operations (Note 13)	1,262,903	1,179,092	927,514
Interest income	(63,613)	(68,389)	(52,208)
Interest expense	2,530	3,517	2,564
Other (income) expense, net	(2,370)	665	(1,783)
Total other income, net	(63,453)	(64,207)	(51,427)
Income before income taxes	1,326,356	1,243,299	978,941
Income tax expense (Note 5)	302,285	277,208	219,378
Net income	1,024,071	966,091	759,563
Other comprehensive income (loss), net of tax
Unrealized gain on cash flow hedges	3,980	1,584	0
Foreign currency translation gain (loss)	9,755	(505)	(11,698)
Total other comprehensive income (loss), net of tax	13,735	1,079	(11,698)
Comprehensive income	$ 1,037,806	$ 967,170	$ 747,865
Net income per share
Basic (in dollars per share)	$ 7.04	$ 6.36	$ 4.89
Diluted (in dollars per share)	$ 7.02	$ 6.33	$ 4.86
Weighted-average common shares outstanding (Note 12)
Basic (in shares)	145,498	151,992	155,225
Diluted (in shares)	145,805	152,670	156,285