Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Detail)

v2.4.1.9
Leases - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Capital Leased Assets [Line Items]      
Operating leases expense $ 596us-gaap_OperatingLeasesRentExpenseNet $ 563us-gaap_OperatingLeasesRentExpenseNet $ 513us-gaap_OperatingLeasesRentExpenseNet
Machinery and Equipment [Member]      
Capital Leased Assets [Line Items]      
Amortization of machinery and equipment under capital leases $ 54us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
$ 72us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
$ 84us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember