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Balance Sheet Details (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Marketable Securities      
Realized or unrealized gains or losses on marketable securities $ 0    
Accounts Receivable      
Trade and other receivables 12,494   $ 15,488
Long-term contracts:      
Billed 115,004   146,619
Unbilled 236,558   241,726
Allowance for doubtful accounts (320)   (326)
Total accounts receivable 363,736   403,507
Less estimated amounts not currently due (21,130)   (20,926)
Current accounts receivable $ 342,606   382,581
Period that receivables will not be collected within to be classified as not currently due 1 year    
Inventories      
Finished products $ 9,930   10,018
Work in process and inventoried costs under long-term contracts 90,421   62,570
Materials and purchased parts 10,800   12,102
Customer advances (12,441)   (18,328)
Net inventories 98,710   66,362
Costs incurred outside the scope of work or in advance of a contract award 1,000   700
Long-term Capitalized Costs      
Long-term capitalized costs being recognized as cost of sales 2,400 $ 2,000  
Deferred Compensation Plan      
Deferred compensation 11,300   10,600
Carrying value of Rabbi trust to fund deferred compensation liabilities 4,800    
Carrying value of insurance contracts 3,500   $ 3,600
Carrying value of marketable securities $ 1,300    
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 7,300  
Software development expense $ 6,300 $ 5,300