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
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
Settlements of tangible equity units, shares of common stock issued (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