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Inventories (Tables)
 3 Months Ended
Dec. 29, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories, net are as follows: 
 
 
December 29,
2018
 
September 29,
2018
Components, assemblies and parts
 
$
106,496

 
$
93,020

Customer projects in various stages of completion
 
66,466

 
35,675

Finished goods
 
10,503

 
10,414

Total inventories, net
 
$
183,465

 
$
139,109