Restructuring and Asset Impairment Charges Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 517	$ (498)	$ 8,612
Other cash charges	120	662	6
Asset impairment	738	5,724	500
Global Restructuring Plan | Equipment Relocation
Restructuring Cost and Reserve [Line Items]
Severance costs	517	(498)
Other cash charges	120
Asset impairment	$ 738	$ 5,723	500
Global Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs			$ 8,612