Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net income	$ 88,295	$ 67,177
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,018	14,283
Loss on disposal of property and equipment	131	19
Deferred income taxes	3,656	5,827
Amortization of debt origination costs	2,918	1,711
Stock-based compensation costs	4,356	3,902
Non-cash operating lease cost	3,587	3,154
Interest expense relating to finance lease liability	109	0
Changes in operating assets and liabilities:
Accounts receivable	29,358	5,982
Inventories	3,213	(6,400)
Prepaid expenses and other current assets	(2,476)	(3,128)
Accounts payable	(9,183)	8,465
Accrued liabilities	(8,125)	6,616
Operating lease liabilities	(3,446)	(3,398)
Other	(118)	(1,210)
Net cash provided by operating activities	127,293	103,000
Investing Activities
Purchases of property, plant and equipment	(11,619)	(5,822)
Net cash used in investing activities	(11,619)	(5,822)
Financing Activities
Term loan repayments	(130,000)	0
Borrowings under revolving credit agreement	0	30,000
Repayments under revolving credit agreement	(55,000)	(76,000)
Payments of finance leases	(712)	0
Proceeds from exercise of stock options	1,285	544
Fair value of shares surrendered as payment of tax withholding	(1,242)	(880)
Repurchase of common stock	(997)	(49,976)
Net cash used in financing activities	(186,666)	(96,312)
Effects of exchange rate changes on cash and cash equivalents	2,835	(491)
(Decrease) increase in cash and cash equivalents	(68,157)	375
Cash and cash equivalents - beginning of period	94,760	27,530
Cash and cash equivalents - end of period	26,603	27,905
Interest paid	42,423	48,033
Income taxes paid	$ 18,818	$ 14,655