Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($)
Restructuring Reserve [Roll Forward]
Accrued restructuring balance	$ 0
Charges to operations	1,527
Cash payments	(1,092)
Accrued restructuring balance	435
Severance pay and benefits
Restructuring Reserve [Roll Forward]
Accrued restructuring balance	0
Charges to operations	1,325
Cash payments	(1,063)
Accrued restructuring balance	262
Facility exit and Relocation costs
Restructuring Reserve [Roll Forward]
Accrued restructuring balance	0
Charges to operations	202
Cash payments	(29)
Accrued restructuring balance	$ 173