Income Taxes 2 of 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 50,786	$ 56,142
Deferred tax assets:
State and foreign net operating loss carryforwards	12,151	11,797
Employee benefit plans	42,694	38,146
Insurance reserves	5,355	6,144
Accrued vacation and incentive costs	3,984	3,038
Federal tax credit carryforwards	1,601	517
Equity compensation	3,711	3,213
Other	5,330	5,637
Valuation allowance	(4,585)	(4,131)
Deferred tax assets after valuation allowance	121,027	120,503
Deferred tax liabilities:
Property, plant, and equipment	(4,016)	(3,448)
Intangible assets	(83,843)	(43,956)
Total deferred tax liabilities	(87,859)	(47,404)
Net deferred tax assets (liabilities)	33,168	73,099
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	1,092	1,833	$ 2,357
Additions for prior year tax positions	0	0	0
Additions for current year tax positions	0	0	0
Reductions for prior year tax positions	0	0	(198)
Settlements	0	(771)	(50)
Foreign currency translation	(9)	30	(276)
Lapses in statutes of limitation	(108)	0	0
Ending balance	$ 975	$ 1,092	$ 1,833