CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income	$ 93,581	$ 58,459
Reconciliation of net income to net cash used in operating activities:
Depreciation, amortization and accretion	19,499	19,966
Bad debt expense	7,163	976
Deferred tax expense (benefit)	1,503	(412)
Stock-based compensation	7,635	8,497
Excess tax benefit from stock-based compensation	(1,653)	(2,004)
Loss on disposal of property and equipment	135	391
Impairment of operating lease assets and other long-lived assets	2,680	123
Changes in operating assets and liabilities:
Trade accounts receivable, net	(147,832)	(156,975)
Inventories, net	(172,518)	(280,032)
Prepaid expenses and other current assets	(12,012)	(15,049)
Income tax receivable	(3,205)	(3,152)
Net operating lease assets and liabilities	(3,385)	(817)
Other assets	(2,213)	(139)
Trade accounts payable	162,289	188,413
Other accrued expenses	11,434	(31,056)
Income taxes payable	22,260	(3,331)
Long-term liabilities	(1,322)	(14)
Net cash used in operating activities	(15,961)	(216,156)
INVESTING ACTIVITIES
Purchases of property and equipment	(13,333)	(14,944)
Proceeds from sales of property and equipment	49	240
Net cash used in investing activities	(13,284)	(14,704)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	9,100	29,463
Repayments of short-term borrowings	0	(16,000)
Proceeds from issuance of stock	698	618
Proceeds from exercise of stock options	1,381	2,959
Repurchases of common stock	0	(190,405)
Cash paid for shares withheld for taxes	(7,054)	(5,744)
Repayments of mortgage principal	(309)	(294)
Net cash provided by (used in) financing activities	3,816	(179,403)
Effect of foreign currency exchange rates on cash and cash equivalents	2,406	(1,756)
Net change in cash and cash equivalents	(23,023)	(412,019)
Cash and cash equivalents at beginning of period	649,436	589,692
Cash and cash equivalents at end of period	626,414	177,673
Cash paid during the period
Income taxes, net of refunds of $1,292 and $5,282, as of September 30, 2020 and 2019, respectively	11,764	17,508
Interest	1,505	1,118
Operating leases	28,911	30,093
Non-cash investing activities
Accrued for purchases of property and equipment	3,598	4,260
Accrued for asset retirement obligations	$ 323	$ 96