CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income	$ 58,459	$ 43,965
Reconciliation of net income to cash used in operating activities:
Depreciation, amortization and accretion	19,966	22,134
Loss on extinguishment of debt	0	445
Bad debt expense	976	2,394
Deferred tax benefit	(412)	(2,009)
Stock-based compensation	8,401	7,362
Employee stock purchase plan	96	90
Excess tax benefits from stock-based compensation	(2,004)	(1,336)
Loss (gain) on disposal of property and equipment	391	(94)
Impairment of intangible and other long-lived assets	123	0
Restructuring charges	0	295
Changes in operating assets and liabilities:
Trade accounts receivable, net	(156,975)	(158,883)
Inventories, net	(280,032)	(227,257)
Prepaid expenses and other current assets	(15,049)	(4,965)
Income tax receivable	(3,152)	445
Net operating lease assets and liabilities	(817)
Other assets	(139)	1,722
Trade accounts payable	188,413	183,638
Accrued expenses	(31,056)	(27,928)
Income taxes payable	(3,331)	1,921
Long-term liabilities	(14)	(2,675)
Net cash used in operating activities	(216,156)	(160,736)
INVESTING ACTIVITIES
Purchases of property and equipment	(14,944)	(14,091)
Proceeds from sale of property and equipment, net	240	68
Net cash used in investing activities	(14,704)	(14,023)
FINANCING ACTIVITIES
Proceeds from short-term borrowings	29,463	108,001
Repayments of short-term borrowings	(16,000)	(37,000)
Debt issuance costs on short-term borrowings	0	(1,276)
Proceeds from issuance of stock for employee stock purchase plan	618	475
Proceeds from exercise of options	2,959	0
Repurchase of common stock	(190,405)	(134,735)
Cash paid for shares withheld for taxes	(5,744)	(4,590)
Repayment of mortgage principal	(294)	(279)
Net cash used in financing activities	(179,403)	(69,404)
Effect of foreign currency exchange rates on cash	(1,756)	(3,615)
Net change in cash and cash equivalents	(412,019)	(247,778)
Cash and cash equivalents at beginning of period	589,692	429,970
Cash and cash equivalents at end of period	177,673	182,192
Cash paid during the period
Income taxes, net of refunds of $5,282 and $3,730, as of September 30, 2019 and 2018, respectively	17,508	8,682
Interest	1,118	2,272
Operating leases	30,093
Non-cash investing activities
Accrued for purchases of property and equipment	4,260	2,968
Accrued for asset retirement obligations	$ 96	$ 70