Restructuring - Changes to Restructuring Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Liability	$ 7,284	$ 2,955
Restructuring expense	4,653	9,196	$ 6,854
Cash expenditures	(6,801)	(4,867)
Restructuring Liability	5,136	7,284	2,955
Employee Severance
Restructuring Reserve [Roll Forward]
Restructuring Liability	7,050	2,640
Restructuring expense	4,220	8,899
Cash expenditures	(6,423)	(4,489)
Restructuring Liability	4,847	7,050	2,640
Facility Closures
Restructuring Reserve [Roll Forward]
Restructuring Liability	234	315
Restructuring expense	433	297
Cash expenditures	(378)	(378)
Restructuring Liability	$ 289	$ 234	$ 315