Restructuring Schedule of Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended		23 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring charges			$ 1,667	$ 7,577
Fiscal Year 2016 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance restructuring reserve			11,080
Restructuring charges	$ 149	$ 4,945	1,667	$ 7,577	$ 28,984	$ 24,673	$ 55,324
Paid in cash			(7,670)
Ending balance restructuring reserve	5,077		5,077		11,080		5,077
Lease termination costs | Fiscal Year 2016 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance restructuring reserve			4,572
Restructuring charges			149
Paid in cash			(880)
Ending balance restructuring reserve	3,841		3,841		4,572		3,841
Severance costs | Fiscal Year 2016 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance restructuring reserve			2,555
Restructuring charges			0
Paid in cash			(2,416)
Ending balance restructuring reserve	139		139		2,555		139
Termination of various contracts and other services | Fiscal Year 2016 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance restructuring reserve			3,953
Restructuring charges			1,518
Paid in cash			(4,374)
Ending balance restructuring reserve	$ 1,097		$ 1,097		$ 3,953		$ 1,097