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Receivables (Tables)
9 Months Ended
Jun. 29, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable
Receivables consist of:
 
 
June 29,
2019
 
September 29,
2018
Accounts receivable
 
$
230,474

 
$
295,180

Long-term contract receivables:
 
 
 
 
Billed receivables
 
232,600

 
156,414

Unbilled receivables
 
444,762

 
316,489

Total long-term contract receivables
 
677,362

 
472,903

Other
 
20,123

 
30,787

Less allowance for doubtful accounts
 
(5,106
)
 
(4,959
)
Receivables
 
$
922,853

 
$
793,911