CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES
Net income	$ 516,822	$ 451,949	$ 382,575
Reconciliation of net income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion	47,858	42,878	40,530
Amortization on cloud computing arrangements	2,149	1,552	737
Loss on extinguishment of debt	226	0	0
Bad debt expense (benefit)	1,983	(342)	3,053
Deferred tax benefit	(9,719)	(27,796)	(8,171)
Stock-based compensation	26,897	26,816	22,701
Loss on disposal of long-lived assets	2,691	107	1,019
Impairment of intangible assets	0	0	3,522
Impairment of operating lease and other long-lived assets	2,817	3,186	14,084
Gain on settlement of asset retirement obligations	0	0	(207)
Changes in operating assets and liabilities:
Trade accounts receivable, net	(806)	(86,627)	(33,173)
Inventories	(26,056)	(228,554)	33,378
Prepaid expenses and other current assets	(5,609)	(19,095)	(22,128)
Income tax receivable	13,459	(11,933)	1,842
Net operating lease assets and lease liabilities	(8,308)	3,189	250
Other assets	13,240	(28,296)	(3,103)
Trade accounts payable	(74,247)	89,184	79,176
Other accrued expenses	11,528	(20,370)	53,785
Income tax payable	4,897	(24,494)	25,817
Other long-term liabilities	17,600	999	530
Net cash provided by operating activities	537,422	172,353	596,217
INVESTING ACTIVITIES
Purchases of property and equipment	(81,025)	(51,017)	(32,218)
Proceeds from sales of property and equipment	12	8	49
Net cash used in investing activities	(81,013)	(51,009)	(32,169)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	0	0	9,100
Repayments of short-term borrowings	0	0	(9,478)
Loan origination costs on revolving credit facilities	(1,537)	0	0
Proceeds from issuance of stock	2,170	1,991	1,502
Proceeds from exercise of stock options	4,396	1,204	6,775
Repurchases of common stock	(297,372)	(356,653)	(99,147)
Cash paid for shares withheld for taxes	(16,688)	(14,024)	(7,432)
Repayments of mortgage principal	0	0	(30,901)
Net cash used in financing activities	(309,031)	(367,482)	(129,581)
Effect of foreign currency exchange rates on cash and cash equivalents	(9,110)	304	5,458
Net change in cash and cash equivalents	138,268	(245,834)	439,925
Cash and cash equivalents at beginning of period	843,527	1,089,361	649,436
Cash and cash equivalents at end of period	981,795	843,527	1,089,361
Cash paid during the period
Income taxes, net of refunds of $1,421, $77, and $1,564, as of March 31, 2023, 2022, and 2021, respectively	134,565	192,013	104,068
Interest	1,880	1,842	2,931
Operating leases	60,353	55,588	57,376
Non-cash investing activities
Change in accounts payable and other accrued expenses for purchases of property and equipment	5,325	2,797	2,721
Accrued for asset retirement obligation assets related to leasehold improvements	8,203	3,900	1,842
Leasehold improvements acquired through tenant allowances	0	4,061	0
Non-cash financing activities
Accrued for shares withheld for taxes	5,371	8,435	11,679
Accrued excise taxes related to repurchases of common stock	$ 569	$ 0	$ 0