Shareholders' Equity (Equity Component) (Details) - Equity Component	3 Months Ended			12 Months Ended
	Sep. 28, 2019 Tangible_Equity_Unit shares	Jun. 29, 2019 Tangible_Equity_Unit shares	Sep. 30, 2017 Tangible_Equity_Unit shares	Sep. 29, 2018 shares	Sep. 30, 2017 shares
Debt Instrument [Line Items]
Settlement of tangible equity units, settled (in units) | Tangible_Equity_Unit	283,000	394,000	473,000
Number of equity instruments per contract (in shares)	1.9841
Settlement of tangible equity units (in shares)	561,000	781,000	939,000
Tangible equity units, outstanding units (in units) | Tangible_Equity_Unit	0
Minimum | Common Class A
Debt Instrument [Line Items]
Number of equity instruments per contract (in shares)		1.9841	1.9841	1.9841	1.9841