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Balance Sheet Details (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Accounts Receivable          
Billed $ 123,661   $ 123,661   $ 184,983
Unbilled 204,877   204,877   186,950
Allowance for doubtful accounts (1,334)   (1,334)   (436)
Total accounts receivable 327,204   327,204   371,497
Less estimated amounts not currently due (14,791)   (14,791)   (17,457)
Current accounts receivable 312,413   $ 312,413   354,040
Period that receivables will not be collected within to be classified as not currently due     1 year    
Inventories          
Finished products 2,391   $ 2,391   4,369
Work in process and inventoried costs under long-term contracts 110,588   110,588   84,131
Materials and purchased parts 20,948   20,948   10,163
Customer advances (7,522)   (7,522)   (10,948)
Net inventories 126,405   126,405   87,715
Costs incurred outside the scope of work or in advance of a contract award 2,800   2,800   4,300
Long-term Capitalized Costs          
Long-term capitalized costs being recognized as cost of sales 2,300 $ 2,200 6,600 $ 7,000  
Deferred Compensation Plan          
Deferred compensation 11,300   11,300   11,300
Carrying value of Rabbi trust to fund deferred compensation liabilities 6,200   $ 6,200   $ 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 1,900 5,200 $ 6,500 11,700  
Software development expense $ 2,800 $ 5,600 $ 13,100 $ 15,600