Accrued Liabilities and Other Non-current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Accrued Liabilities [Abstract]
Accrued payroll	$ 37,391	$ 25,151
Accrued income taxes payable	5,568	2,287
Accrued health insurance	1,606	2,982
Accrued general and product liability costs	3,500	3,500
Customer advances, deposits, and rebates	18,911	19,210
Profit Sharing Payable	0	14,103
Other accrued liabilities	32,987	30,164
Accrued liabilities	99,963	97,397
Liability, Other Postretirement Defined Benefit Plan, Noncurrent	2,835	3,615
Standard Product Warranty Accrual, Noncurrent	10,082	9,835
Liability, Defined Benefit Pension Plan, Noncurrent	131,725	147,121
Investment Foreign Currency, Contract, Amount Purchased	38,209	7,459
Deferred income tax	30,262	28,689
Other Sundry Liabilities, Noncurrent	10,853	16,064
Other non-current liabilities	$ 223,966	$ 212,783