CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income	$ 150,187	$ 93,581
Reconciliation of net income to net cash used in by operating activities:
Depreciation, amortization, and accretion	19,931	19,499
Amortization on cloud computing arrangements	767	204
Bad debt (benefit) expense	(10)	7,163
Deferred tax (benefit) expense	(3,239)	1,503
Stock-based compensation	11,792	7,635
Loss on disposal of long lived assets	23	135
Impairment of operating lease assets and leasehold improvements	0	2,680
Gain on settlement of asset retirement obligations	0	(165)
Changes in operating assets and liabilities:
Trade accounts receivable, net	(154,633)	(147,832)
Inventories, net	(358,028)	(172,518)
Prepaid expenses and other current assets	(10,942)	(12,012)
Income tax receivable	(7,505)	(3,205)
Net operating lease assets and lease liabilities	5,947	(3,385)
Other assets	(28,387)	(2,417)
Trade accounts payable	256,028	162,289
Other accrued expenses	(37,673)	11,434
Income taxes payable	(19,729)	20,607
Other long-term liabilities	2,797	(1,157)
Net cash used in operating activities	(172,674)	(15,961)
INVESTING ACTIVITIES
Purchases of property and equipment	(26,719)	(13,333)
Proceeds from sales of property and equipment	0	49
Net cash used in investing activities	(26,719)	(13,284)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	0	9,100
Proceeds from issuance of stock	914	698
Proceeds from exercise of stock options	69	1,381
Repurchases of common stock	(135,973)	0
Cash paid for shares withheld for taxes	(9,280)	(7,054)
Repayments of mortgage principal	0	(309)
Net cash (used in) provided by financing activities	(144,270)	3,816
Effect of foreign currency exchange rates on cash and cash equivalents	513	2,407
Net change in cash and cash equivalents	(343,150)	(23,022)
Cash and cash equivalents at beginning of period	1,089,361	649,436
Cash and cash equivalents at end of period	746,211	626,414
Cash paid during the period
Income taxes, net of refunds of $71 and $1,292, as of September 30, 2021 and 2020, respectively	74,312	11,764
Interest	936	1,505
Operating leases	28,470	28,911
Non-cash investing activities
Accrued for purchases of property and equipment	5,959	3,598
Accrued for asset retirement obligations	3,505	323
Leasehold improvements acquired through tenant allowances	$ 4,061	$ 0