Employee Benefit Plans - Pension Plan's Funded Status and Amounts Recognized Related to the Pension Plan and the Postretirement Benefit Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Change in benefit obligation
Benefit obligation at end of year	$ 3,479	$ 3,266
Postretirement Benefits
Change in benefit obligation
Benefit obligation at beginning of year	948	759
Service cost
Interest cost	30	34
Actuarial (gain)/loss	(271)	197
Benefits paid	(33)	(42)
Benefit obligation at end of year	674	948
Change in plan assets
Fair value of plan assets at beginning of year
Employer contributions	33	42
Benefits paid	(33)	(42)
Fair value of plan assets at end of year
Under funded status at end of year	(674)	(948)
Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	3,266	3,207
Service cost
Interest cost	115	140
Actuarial (gain)/loss	153	316
Foreign currency exchange rate changes	236	(126)
Benefits paid	(291)	(271)
Benefit obligation at end of year	3,479	3,266
Change in plan assets
Fair value of plan assets at beginning of year
Fair value of plan assets at end of year
Under funded status at end of year	$ (3,479)	$ (3,266)