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Balance Sheet Details (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Marketable Securities          
Realized or unrealized gains or losses on marketable securities     $ 0    
Accounts Receivable          
Trade and other receivables $ 9,665   9,665   $ 15,488
Long-term contracts:          
Billed 111,256   111,256   146,619
Unbilled 243,759   243,759   241,726
Allowance for doubtful accounts (412)   (412)   (326)
Total accounts receivable 364,268   364,268   403,507
Less estimated amounts not currently due (19,562)   (19,562)   (20,926)
Current accounts receivable 344,706   $ 344,706   382,581
Period that receivables will not be collected within to be classified as not currently due     1 year    
Inventories          
Finished products 9,461   $ 9,461   10,018
Work in process and inventoried costs under long-term contracts 101,551   101,551   62,570
Materials and purchased parts 9,448   9,448   12,102
Customer advances (6,596)   (6,596)   (18,328)
Net inventories 113,864   113,864   66,362
Costs incurred outside the scope of work or in advance of a contract award 1,100   1,100   700
Long-term Capitalized Costs          
Long-term capitalized costs being recognized as cost of sales 2,400 $ 2,100 4,800 $ 4,300  
Deferred Compensation Plan          
Deferred compensation 10,400   10,400   10,600
Carrying value of Rabbi trust to fund deferred compensation liabilities 5,000   5,000    
Carrying value of insurance contracts 4,900   4,900   $ 3,600
Carrying value of marketable securities 100   $ 100    
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 4,500 7,400 $ 6,500 14,700  
Software development expense $ 3,700 $ 6,900 $ 10,000 $ 12,200