Fair Value Measurements - Carrying Value and Estimated Fair Value of Notes (Details) - USD ($) $ in Thousands	Jul. 05, 2020	Sep. 29, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,404,503	$ 1,303,594
Senior Notes | Class A-1 Variable Funding Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes	107,876	0
Carrying Amount | Senior Notes | Class A-2 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,293,500	1,300,000
Fair Value | Senior Notes | Class A-2 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,337,755	$ 1,344,300