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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Disclosure - Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) [Line Items]    
Accounts payable $ 3,105 $ 7,146
Accrued miscellaneous expenses 7,195 9,172
Accrued inventories in transit 1,442 779
Accrued outside services 2,763 2,251
Accrued subcontractor program costs 556 2,442
Accrued compensation 4,447 5,506
Income taxes payable 147 133
Accrued warranty 3,069 2,709
Total $ 22,724 $ 30,138