Revenue Recognition - Contract Asset and Liability (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($)
Contract With Customer, Asset And Liability [Roll Forward]
Unbilled AR, Beginning balance as of March 31, 2018	$ 3,016
Deferred Program Costs, Beginning balance as of March 31, 2018	2,567
Contract Liabilities, Beginning balance as of March 31, 2018	21,937
Deferred Program Costs, Increases for costs incurred to fulfill performance obligations	1,132
Unbilled AR, Increase (decrease) due to customer billings	(3,221)
Contract Liabilities, Increases (decreases) due to customer billings	4,281
Deferred Program Costs, Decrease due to cost recognition on completed performance obligations	(48)
Unbilled AR, Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	4,824
Deferred Program Costs, Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(9)
Contract Liabilities, Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(3,324)
Unbilled AR, Other changes and FX impact	(16)
Deferred Program Costs, Other changes and FX impact	34
Contract Liabilities, Other changes and FX impact	(764)
Unbilled AR, Ending balance as of June 30, 2018	4,603
Deferred Program Costs, Ending Balance as of June 30, 2018	2,077
Contract Liabilities, Ending balance as of June 30, 2018	19,473
Accounting Standards Update 2014-09
Contract With Customer, Asset And Liability [Roll Forward]
Unbilled AR, Impact of adoption of ASC 606	0
Deferred Program Costs, Impact of adoption of ASC 606	(1,599)
Contract Liabilities, Impact of adoption of ASC 606	$ (2,657)