Income Taxes 2 of 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$ 444	$ 0	$ 0
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	26,450	50,786
Deferred tax assets:
State and foreign net operating loss carryforwards	10,376	12,151
Employee benefit plans	28,390	42,694
Insurance reserves	3,578	5,355
Accrued vacation and incentive costs	4,625	3,984
Federal tax credit carryforwards	2,476	1,601
Equity compensation	2,285	3,711
Other	3,666	5,330
Valuation allowance	(4,671)	(4,585)
Deferred tax assets after valuation allowance	77,175	121,027
Deferred tax liabilities:
Property, plant, and equipment	(2,785)	(4,016)
Intangible assets	(72,210)	(83,843)
Total deferred tax liabilities	(74,995)	(87,859)
Net deferred tax assets (liabilities)	2,180	33,168
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	975	1,092	1,833
Reductions for prior year tax positions	0	0	0
Settlements	0	0	(771)
Foreign currency translation	20	(9)	30
Lapses in statutes of limitation	(847)	(108)	0
Ending balance	$ 592	$ 975	$ 1,092