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Receivables (Tables)
 9 Months Ended
Jun. 27, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable
Receivables consist of:
 
 
June 27,
2020
 
September 28,
2019
Accounts receivable
 
$
388,525

 
$
477,154

Unbilled receivables
 
506,429

 
468,824

Other
 
7,550

 
13,779

Less allowance for doubtful accounts
 
(5,846
)
 
(5,402
)
Receivables
 
$
896,658

 
$
954,355