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Inventories (Tables)
 9 Months Ended
Jun. 29, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories, net are as follows: 
 
 
June 29,
2019
 
September 29,
2018
Components, assemblies and parts
 
$
107,389

 
$
93,020

Customer projects in various stages of completion
 
45,814

 
35,675

Finished goods
 
11,650

 
10,414

Total inventories, net
 
$
164,853

 
$
139,109