Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (53,545)	$ (36,520)	$ 28,504
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	13,967	10,487	8,477
Amortization of inventory step-up	10,681	17,881	3,577
Accretion of asset retirement obligation	129	51	0
Accretion of contingent consideration	64	0	0
Accretion of investment discount	0	(69)	(196)
Change in valuation of contingent consideration	(298)	0	0
Impairment of goodwill and intangible assets	15,309	33,358	0
Impairment of property, plant, and equipment	1,408	0	0
Provision for accounts receivable allowances	5,299	4,035	5,188
Deferred tax provision (benefit)	6,736	(14,125)	(1,608)
Share-based compensation expense	2,044	1,938	1,653
Gain on bargain purchases	0	0	(19,990)
(Gain) loss on sale or disposal of assets	409	(12)	88
(Gain) loss on interest rate swap	580	0	0
Changes in assets and liabilities, net of effects of purchase of businesses:
Accounts receivable	4,151	(6,409)	(6,095)
Inventories	(4,358)	16,082	(3,607)
Prepaid expenses and other assets	(3,382)	(273)	2,506
Accounts payable	5,694	(220)	(1,153)
Accrued expenses and long-term obligations	(3,888)	5,164	(2,473)
Net cash provided by operating activities	1,000	31,368	14,871
Cash flows from investing activities:
Maturities of investment securities	0	20,000	60,000
Purchase of held-to-maturity investment securities	0	0	(19,928)
Purchase of businesses	(2,500)	(65,228)	(15,039)
Final payment of purchase price for a business previously acquired	(2,500)	0	0
Purchase of property, plant and equipment	(10,597)	(7,291)	(4,957)
Purchase of company owned life insurance policy	(750)	(750)	0
Purchase of intangibles	(302)	0	(100)
Proceeds from sale of assets	1,659	36	311
Net cash (used for) provided by investing activities	(14,990)	(53,233)	20,287
Cash flows from financing activities:
Borrowings on credit facility	41,714	87,476	0
Repayments on credit facility	(55,575)	(47,476)	0
Payment of financing transaction costs	(1,964)	0	0
Payments on long-term debt	(127)	(220)	(65)
Dividends paid	(7,179)	(7,293)	(7,273)
Purchase of treasury stock	(4,372)	0	0
Proceeds from exercise of stock options	0	201	123
Payments for tax withholding on net restricted stock settlements	(9)	0	(527)
Tax effect of stock awards	0	0	286
Net cash provided by (used for) financing activities	(27,512)	32,688	(7,456)
Effect of exchange rate changes on cash	42	44	64
Net increase (decrease) in cash and cash equivalents	(41,460)	10,867	27,766
Cash and cash equivalents at beginning of year	58,560	47,693	19,927
Cash and cash equivalents at end of year	$ 17,100	$ 58,560	$ 47,693