Loss Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Loss Contingency Accrual [Roll Forward]
Accrued general and product liability, beginning of year	$ 13,335	$ 14,535	$ 12,530
Add provision for claims	3,965	7,223	5,277
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability	0	0	1,523
Deduct payments for claims	(3,718)	(8,423)	(4,795)
Accrued general and product liability, end of year	$ 13,582	$ 13,335	$ 14,535