Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - Investments, Additional Information (Details)

v3.20.2
Organization and Significant Accounting Policies - Investments, Additional Information (Details)
$ in Millions
12 Months Ended
Sep. 26, 2020
USD ($)
company
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of unconsolidated companies | company 11    
Equity income (loss) $ (3.9) $ 1.2 $ (2.8)
Investment in unconsolidated companies $ 13.1 $ 12.1  
Minimum      
Schedule of Equity Method Investments [Line Items]      
Owned percentage in unconsolidated entities 7.00%    
Maximum      
Schedule of Equity Method Investments [Line Items]      
Owned percentage in unconsolidated entities 50.00%