Restructuring - Summary of Aggregated Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 14,843	$ 5,404	$ 4,178
Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,256	3,190	2,375
Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12,587	$ 2,214	$ 1,803