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Balance Sheet Details (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Accounts Receivable          
Billed $ 140,251   $ 140,251   $ 184,983
Unbilled 170,485   170,485   186,950
Allowance for doubtful accounts (863)   (863)   (436)
Total accounts receivable 309,873   309,873   371,497
Less estimated amounts not currently due (16,568)   (16,568)   (17,457)
Current accounts receivable 293,305   $ 293,305   354,040
Period that receivables will not be collected within to be classified as not currently due     1 year    
Inventories          
Finished products 3,032   $ 3,032   4,369
Work in process and inventoried costs under long-term contracts 98,733   98,733   84,131
Materials and purchased parts 15,101   15,101   10,163
Customer advances (11,119)   (11,119)   (10,948)
Net inventories 105,747   105,747   87,715
Costs incurred outside the scope of work or in advance of a contract award 1,600   1,600   4,300
Long-term Capitalized Costs          
Long-term capitalized costs being recognized as cost of sales 2,100 $ 2,400 3,600 $ 4,800  
Deferred Compensation Plan          
Deferred compensation 11,400   11,400   11,400
Carrying value of Rabbi trust to fund deferred compensation liabilities 6,000   $ 6,000   $ 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 2,000 4,500 $ 4,600 6,500  
Software development expense $ 4,000 $ 3,700 $ 10,300 $ 10,000