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Leases - Maturity Analysis of the Future Undiscounted Cash Flows of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2018	Dec. 29, 2019	Sep. 29, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020		$ 59,146
2021		62,919
2022		51,443
2023		33,497
2024		22,540
Beyond		26,380
Total lease payments		255,925
Less: imputed interest		(12,846)
Total present value of lease liabilities		$ 243,079
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Total liability			$ 343,500
2020			108,800
2021			66,400
2022			51,400
2023			36,500
2024			25,800
Due after year 2024			$ 54,600
Rent expense	$ 19,400