Earnings Per Share (Narrative) (Details) - shares	3 Months Ended			12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Sep. 30, 2017	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)				1,113,000	805,000	584,000
Equity Component
Class of Stock [Line Items]
Convertible, number of equity instruments per contract (in shares)	1.9841
Equity Component | Minimum | Common Class A
Class of Stock [Line Items]
Convertible, number of equity instruments per contract (in shares)		1.9841	1.9841			1.9841