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Revenue from Contracts with Customers (Tables)
3 Months Ended
Dec. 29, 2018
Revenue from Contract with Customer [Abstract]  
Contract Assets and Liabilities Total contract assets and contract liabilities as of December 29, 2018 are as follows:
 
 
December 29, 2018
 
September 30, 2018
Unbilled receivables
 
$
420,093

 
$
405,610

Contract advances
 
183,855

 
152,608

Net contract assets
 
$
236,238

 
$
253,002