Annual report pursuant to Section 13 and 15(d)

The Company and Its Accounting Policies - Accompanying Consolidated Balance Sheets (Detail)

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The Company and Its Accounting Policies - Accompanying Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Accounting Policies [Abstract]    
Unbilled revenue $ 18,665us-gaap_UnbilledContractsReceivable $ 7,830us-gaap_UnbilledContractsReceivable
Progress payments reducing inventory (Note 2) (3,143)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms (5,080)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms
Customer deposits (4,179)us-gaap_CustomerDepositsCurrent (8,012)us-gaap_CustomerDepositsCurrent
Net under (over) billings 11,343us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear  
Net under (over) billings   $ (5,262)us-gaap_BillingsInExcessOfCostCurrent