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Accounts Payable And Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Schedule Of Accounts Payable And Accrued Expenses [Line Items]        
Accounts payable $ 3,390 $ 8,191    
Accrued investories in-transit 2,954 3,330    
Accrued miscellaneous expenses 8,806 9,708    
Accrued subcontractor program costs 1,642 1,885    
Accrued compensation 4,930 8,380    
Income taxes payable 81 192    
Accrued warranty 4,792 5,896    
Total $ 26,595 $ 37,582    
Warranty period     1 year 3 years