Loss Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Loss Contingency Accrual [Roll Forward]
Accrued general and product liability, beginning of year	$ 14,535	$ 12,530	$ 14,480
Add provision for claims	7,223	5,277	3,726
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability	0
Deduct payments for claims	(8,423)	(4,795)	(5,676)
Accrued general and product liability, end of year	$ 13,335	$ 14,535	$ 12,530