Accrued Liabilities and Other Non-current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Accrued Liabilities [Abstract]
Accrued payroll	$ 25,151	$ 18,597
Interest payable	99	13
Accrued workers compensation	1,257	965
Accrued income taxes payable	2,287	819
Accrued health insurance	2,982	2,498
Accrued general and product liability costs	3,500	3,895
Customer advances, deposits, and rebates	19,210	10,370
Profit Sharing Payable	14,103
Other accrued liabilities	28,808	16,053
Accrued liabilities	97,397	53,210
Accumulated postretirement benefit obligation	3,615	4,540
Accrued general and product liability costs	9,835	10,640
Accrued pension cost	147,121	102,467
Accrued workers compensation	702	2,307
Investment Foreign Currency, Contract, Amount Purchased	7,459
Deferred income tax	28,689	59
Other non-current liabilities	15,362	9,626
Other non-current liabilities	$ 212,783	$ 129,639