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Revenue from Contracts with Customers (Tables)
9 Months Ended
Jun. 29, 2019
Revenue from Contract with Customer [Abstract]  
Contract Assets and Liabilities
Total contract assets and contract liabilities are as follows:
 
 
June 29,
2019
 
September 30, 2018
Unbilled receivables
 
$
444,762

 
$
405,610

Contract advances
 
147,677

 
152,608

Net contract assets
 
$
297,085

 
$
253,002