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Accounts Receivable - Net (Tables)
3 Months Ended
Dec. 30, 2018
Receivables [Abstract]  
Schedule of net accounts receivable and billings in excess of costs on uncompleted contracts
Net accounts receivable consisted of the following:
 
December 30,
2018
 
September 30,
2018
 
(in thousands)
Billed
$
463,159

 
$
464,062

Unbilled
265,974

 
267,739

Total accounts receivable – gross
729,133

 
731,801

Allowance for doubtful accounts
(43,464
)
 
(37,580
)
Total accounts receivable – net
$
685,669

 
$
694,221