Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($)	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Jan. 19, 2018
Line of Credit Facility [Line Items]
Interest expense	$ 15,700,000	$ 17,500,000
2025 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	4.375%
Senior Notes | 2028 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	4.625%		4.625%
Interest expense	$ 4,800,000	0
Senior Notes | 2025 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	4.375%
Interest expense	$ 10,900,000	3,500,000
Senior Notes | 2022 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	5.25%
Interest expense	$ 0	$ 14,000,000