Restructuring Plans - Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Charges to expense	$ 1,050	$ 0	$ 3,177	$ 0
United Kingdom and Australia Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial accrual			557
Charges to expense	425		425
Cash paid	(649)		(703)
Restructuring reserve as of December 31, 2018	279		279
United Kingdom and Australia Restructuring Plan | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Initial accrual			297
Charges to expense			132
Cash paid			(400)
Restructuring reserve as of December 31, 2018	29		29
United Kingdom and Australia Restructuring Plan | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Initial accrual			127
Charges to expense			152
Cash paid			(87)
Restructuring reserve as of December 31, 2018	192		192
United Kingdom and Australia Restructuring Plan | Other Costs
Restructuring Cost and Reserve [Line Items]
Initial accrual			133
Charges to expense			141
Cash paid			(216)
Restructuring reserve as of December 31, 2018	$ 58		$ 58