Income Taxes 2 of 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$ 550	$ 444	$ 0
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	21,990	26,450
Deferred tax assets:
State and foreign net operating loss carryforwards	8,069	10,376
Employee benefit plans	27,955	28,390
Insurance reserves	3,204	3,578
Accrued vacation and incentive costs	4,766	4,625
Federal tax credit carryforwards	17,685	2,476
Equity compensation	2,285	2,285
Other	4,449	3,666
Valuation allowance	(16,881)	(4,671)
Deferred tax assets after valuation allowance	73,522	77,175
Deferred tax liabilities:
Property, plant, and equipment	(2,429)	(2,785)
Intangible assets	(63,468)	(72,210)
Total deferred tax liabilities	(65,897)	(74,995)
Net deferred tax assets (liabilities)	7,625	2,180
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	592	975	1,092
Reductions for prior year tax positions	(141)	0	0
Settlements	0	0	0
Foreign currency translation	(65)	20	(9)
Lapses in statutes of limitation	0	(847)	(108)
Ending balance	$ 936	$ 592	$ 975