Earnings Per Share (Narrative) (Details) - shares	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jul. 02, 2016
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	496,000	663,000
Equity Component
Class of Stock [Line Items]
Threshold consecutive trading days	20 days		20 days
Equity Component | Minimum | Common Class A
Class of Stock [Line Items]
Convertible, number of equity instruments per contract (in shares)	1.9841		1.9841
Equity Component | Maximum | Common Class A
Class of Stock [Line Items]
Convertible, number of equity instruments per contract (in shares)	2.3810		2.3810