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Accounts Receivable - Net - Narrative (Details) - USD ($)
6 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Sep. 30, 2018
Accounts Receivable - Net and Revenue Recognition      
Period for billing and collecting unbilled receivables 12 months    
Unbilled accounts receivable related to claims and requests for equitable adjustment on contracts $ 53,000,000   $ 74,000,000
Gains (losses) from claim settlement   $ 0  
Billed accounts receivable related to U.S. federal government contracts 76,200,000   81,500,000
US federal government unbilled contracts receivable 234,577,000   267,739,000
U.S. federal government      
Accounts Receivable - Net and Revenue Recognition      
US federal government unbilled contracts receivable 101,900,000   $ 102,700,000
Revenue from Contract with Customer | RCM      
Accounts Receivable - Net and Revenue Recognition      
Adjustments to contracts based on change in transaction price 4,800,000    
Revenue from Contract with Customer | CIG      
Accounts Receivable - Net and Revenue Recognition      
Adjustments to contracts based on change in transaction price 3,600,000    
Operating Income (Loss) | RCM      
Accounts Receivable - Net and Revenue Recognition      
Adjustments to contracts based on change in transaction price 5,900,000    
Operating Income (Loss) | CIG      
Accounts Receivable - Net and Revenue Recognition      
Adjustments to contracts based on change in transaction price $ 3,600,000