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Balance Sheet Details (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Accounts Receivable      
Trade and other receivables $ 12,182   $ 12,378
Long-term contracts:      
Billed 172,661   195,492
Unbilled 235,583   238,773
Allowance for doubtful accounts (429)   (436)
Total accounts receivable 419,997   446,207
Less estimated amounts not currently due (17,328)   (17,457)
Current accounts receivable $ 402,669   428,750
Period that receivables will not be collected within to be classified as not currently due 1 year    
Inventories      
Finished products $ 2,942   4,369
Work in process and inventoried costs under long-term contracts 101,134   84,131
Materials and purchased parts 9,322   10,163
Customer advances (12,003)   (10,948)
Net inventories 101,395   87,715
Costs incurred outside the scope of work or in advance of a contract award 2,400   4,300
Long-term Capitalized Costs      
Long-term capitalized costs being recognized as cost of sales 2,300 $ 2,400  
Capitalized Software      
Software development expense 6,300 6,300  
Deferred Compensation Plan      
Deferred compensation 12,500   11,400
Carrying value of Rabbi trust to fund deferred compensation liabilities $ 5,700   $ 5,300
Software | Maximum      
Capitalized Software      
Estimated useful life P7Y    
Software | Minimum      
Capitalized Software      
Estimated useful life P3Y    
ERP      
Capitalized Software      
Estimated useful life P7Y    
Addition to capitalized software expenses $ 2,500 $ 2,000