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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2023
Sep. 30, 2022
Oct. 01, 2021
Accounting Policies [Abstract]      
Raw materials and parts $ 217.5 $ 240.3  
Work-in-process 20.0 23.2  
Finished goods 40.0 39.7  
Total inventories 277.5 303.2  
Inventory write-down $ 5.6 $ 6.4 $ 3.5