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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 27, 2020
Mar. 29, 2019
Mar. 27, 2020
Mar. 29, 2019
Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Amortization of intangible assets     $ 58,200 $ 59,100  
Goodwill impairment $ 198,600 $ 0 198,600 $ 0  
Goodwill $ 5,319,626   $ 5,319,626   $ 5,518,800
FSS International          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Reporting unit, percentage of fair value in excess of carrying amount (34.00%)   (34.00%)   22.00%
Goodwill impairment $ 198,600   $ 198,600    
Goodwill 405,901   405,901   $ 608,468
FSS International | Reporting Unit Within FSS International          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Goodwill $ 86,200   $ 86,200