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Revenue Accounting for Contracts - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Sep. 27, 2019
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Liability $ 435,211   $ 414,208
Contract liability revenue recognized in the period $ 244,100 $ 225,200