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Receivables (Tables)
 3 Months Ended
Dec. 29, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable Receivables consist of:
 
 
December 29,
2018
 
September 29,
2018
Accounts receivable
 
$
233,118

 
$
295,180

Long-term contract receivables:
 
 
 
 
Billed receivables
 
202,000

 
156,414

Unbilled receivables
 
420,093

 
316,489

Total long-term contract receivables
 
622,093

 
472,903

Other
 
17,055

 
30,787

Less allowance for doubtful accounts
 
(4,851
)
 
(4,959
)
Receivables
 
$
867,415

 
$
793,911