CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES
Net income	$ 451,949	$ 382,575	$ 276,142
Reconciliation of net income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion	42,878	40,530	38,912
Amortization on cloud computing arrangements	1,552	737	0
Bad debt (benefit) expense	(342)	3,053	3,498
Deferred tax (benefit) expense	(27,796)	(8,171)	2,934
Stock-based compensation	26,816	22,701	14,477
Loss on disposal of long-lived assets	107	1,019	698
Impairment of intangible assets	0	3,522	0
Impairment of operating lease and other long-lived assets	3,186	14,084	1,365
Gain on settlement of asset retirement obligations	0	(207)	(705)
Changes in operating assets and liabilities:
Trade accounts receivable, net	(86,627)	(33,173)	(10,493)
Inventories	(228,554)	33,378	(32,777)
Prepaid expenses and other current assets	(19,095)	(22,128)	2,477
Income tax receivable	(11,933)	1,842	(5,811)
Net operating lease assets and lease liabilities	3,189	250	(3,264)
Other assets	(28,296)	(3,103)	(6,558)
Trade accounts payable	89,184	79,176	23,312
Other accrued expenses	(20,370)	53,785	(11,112)
Income tax payable	(24,494)	25,817	(8,179)
Other long-term liabilities	999	530	1,418
Net cash provided by operating activities	172,353	596,217	286,334
INVESTING ACTIVITIES
Purchases of property and equipment	(51,017)	(32,218)	(32,455)
Proceeds from sales of property and equipment	8	49	491
Net cash used in investing activities	(51,009)	(32,169)	(31,964)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	0	9,100	69,336
Repayments of short-term borrowings	0	(9,478)	(69,197)
Proceeds from issuance of stock	1,991	1,502	1,288
Proceeds from exercise of stock options	1,204	6,775	3,615
Repurchases of common stock	(356,653)	(99,147)	(190,405)
Cash paid for shares withheld for taxes	(14,024)	(7,432)	(6,148)
Repayments of mortgage principal	0	(30,901)	(603)
Net cash used in financing activities	(367,482)	(129,581)	(192,114)
Effect of foreign currency exchange rates on cash and cash equivalents	304	5,458	(2,512)
Net change in cash and cash equivalents	(245,834)	439,925	59,744
Cash and cash equivalents at beginning of period	1,089,361	649,436	589,692
Cash and cash equivalents at end of period	843,527	1,089,361	649,436
Cash paid during the period
Income taxes, net of refunds of $77, $1,564, and $5,389, as of March 31, 2022, 2021, and 2020, respectively	192,013	104,068	74,573
Interest	1,842	2,931	2,466
Operating leases	55,588	57,376	61,120
Noncash investing and financing activities
Change in accounts payable and other accrued expenses for purchases of property and equipment	2,797	2,721	(618)
Accrued for asset retirement obligation assets related to leasehold improvements	3,900	1,842	224
Leasehold improvements acquired through tenant allowances	4,061	0	0
Accrued for shares withheld for taxes	$ 8,435	$ 11,679	$ 0