Income Taxes 2 of 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$ 0	$ 550	$ 444
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	18,091	21,990
Deferred tax assets:
State and foreign net operating loss carryforwards	7,142	8,069
Employee benefit plans	31,471	27,955
Insurance reserves	3,216	3,204
Accrued vacation and incentive costs	3,218	4,766
Federal tax credit carryforwards	11,922	17,685
Deferred Tax Asset Lease Liability	9,048	0
Equity compensation	1,974	2,285
Other	7,319	4,449
Valuation allowance	(15,036)	(16,881)
Deferred tax assets after valuation allowance	78,365	(73,522)
Deferred tax liabilities:
Property, plant, and equipment	(1,962)	(2,429)
Deferred Tax Liability Lease Asset	(8,938)	0
Intangible assets	(59,397)	(63,468)
Total deferred tax liabilities	(70,297)	(65,897)
Net deferred tax assets (liabilities)	8,068	7,625
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	936	592	975
Reductions for prior year tax positions	(802)	(141)	0
Foreign currency translation	(2)	(65)	20
Lapses in statutes of limitation	0	0	(847)
Ending balance	$ 132	$ 936	$ 592