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Income Taxes 2 of 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions $ 0 $ 0 $ 550
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 16,038 18,091  
Deferred tax assets:      
State and foreign net operating loss carryforwards 7,404 7,142  
Employee benefit plans 24,692 31,471  
Insurance reserves 3,488 3,216  
Accrued vacation and incentive costs 3,061 3,218  
Federal tax credit carryforwards 13,238 11,922  
Deferred Tax Asset Lease Liability 8,623 9,048  
Equity compensation 2,782 1,974  
Other 7,308 7,319  
Valuation allowance (15,103) (15,036)  
Deferred tax assets after valuation allowance 71,531 78,365  
Deferred tax liabilities:      
Property, plant, and equipment (1,889) (1,962)  
Deferred Tax Liability Lease Asset (8,446) (8,938)  
Intangible assets (58,716) (59,397)  
Total deferred tax liabilities (69,051) (70,297)  
Net deferred tax assets (liabilities) 2,480 8,068  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 132 936 592
Reductions for prior year tax positions 0 (802) (141)
Foreign currency translation 9 (2) (65)
Lapses in statutes of limitation 0 0 0
Ending balance $ 141 $ 132 $ 936