CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
OPERATING ACTIVITIES
Net income	$ 1,024,071	$ 966,091	$ 759,563
Reconciliation of net income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion	75,773	69,353	57,587
Amortization on cloud computing arrangements	2,236	2,380	2,075
Bad debt expense	6,345	5,032	789
Deferred tax expense (benefit)	8,784	(5,545)	(1,510)
Stock-based compensation	44,835	37,943	37,288
Loss on disposal of assets	1,191	3,183	407
Impairment of intangible assets	0	0	8,164
Impairment of property and equipment and cloud computing arrangements	127	4,290	1,015
Changes in operating assets and liabilities:
Trade accounts receivable, net	7,550	(41,339)	4,157
Inventories	8,208	(24,344)	58,541
Prepaid expenses and other current assets	(23,804)	20,946	(38,490)
Income tax receivable	34,788	6,945	(38,775)
Net operating lease assets and lease liabilities	(10)	(2,583)	(567)
Other assets	(28,832)	6,566	(9,989)
Trade accounts payable	(27,865)	35,636	119,601
Other accrued expenses	16,933	22,222	43,534
Income tax payable	13,175	(29,039)	35,016
Other long-term liabilities	18,450	(33,214)	(5,222)
Net cash provided by operating activities	1,181,955	1,044,523	1,033,184
INVESTING ACTIVITIES
Purchases of property and equipment	(84,623)	(86,171)	(89,365)
Proceeds from sale of assets	11	11,168	34
Net cash used in investing activities	(84,612)	(75,003)	(89,331)
FINANCING ACTIVITIES
Proceeds from issuance of stock	4,509	3,804	2,444
Proceeds from exercise of stock options	0	968	4,786
Repurchases of common stock	(1,075,100)	(567,002)	(414,931)
Cash paid for excise taxes related to repurchases of common stock	(5,043)	(3,985)	0
Cash paid for shares withheld for taxes	(8,410)	(15,119)	(9,974)
Net cash used in financing activities	(1,084,044)	(581,334)	(417,675)
Effect of foreign currency exchange rates on cash and cash equivalents	4,762	(1,049)	(5,922)
Net change in cash and cash equivalents	18,061	387,137	520,256
Cash and cash equivalents at beginning of period	1,889,188	1,502,051	981,795
Cash and cash equivalents at end of period	1,907,249	1,889,188	1,502,051
Cash paid during the period
Interest	2,492	1,789	1,783
Operating leases	92,823	70,326	65,672
Non-cash investing activities
Changes in trade accounts payable and other accrued expenses for purchases of property and equipment	(5,559)	3,819	(6,705)
Accrued for asset retirement obligation assets related to leasehold improvements	8,464	2,233	2,278
Leasehold improvements acquired through tenant allowances	0	0	8,127
Non-cash financing activities
Accrued for shares withheld for taxes	6,602	17,148	22,287
Accrued excise taxes related to repurchases of common stock	$ 10,413	$ 5,043	$ 3,416