Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 844	$ 199
Charges to operations	1,445	764
Cash payments	(1,509)	(636)
Non-cash/miscellaneous reductions		(196)
Accrued restructuring balance	780	131
Severance Pay and Benefits
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	844	145
Charges to operations	632	751
Cash payments	(696)	(599)
Non-cash/miscellaneous reductions		(166)
Accrued restructuring balance	780	131
Facility Exit and Relocation Costs
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance		54
Charges to operations	814	13
Cash payments	(814)	(37)
Non-cash/miscellaneous reductions		$ (30)