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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]        
Depreciation expense   $ 80.6 $ 97.4 $ 72.3
HPC        
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 13.5