Shareholders' Equity (Equity Component) (Details) Tangible_Equity_Unit in Thousands		3 Months Ended			9 Months Ended
	Jul. 01, 2019 Tangible_Equity_Unit shares	Jun. 29, 2019 Tangible_Equity_Unit shares	Sep. 30, 2017 Tangible_Equity_Unit shares	Jul. 02, 2016 trade_day $ / shares $ / per_TEU shares	Jun. 29, 2019 trade_day shares	Sep. 29, 2018 Tangible_Equity_Unit
Debt Instrument [Line Items]
Fair value price per TEU (in dollars per tangible equity unit) | $ / per_TEU				100
Equity Component
Debt Instrument [Line Items]
Fair value price per TEU (in dollars per tangible equity unit) | $ / per_TEU				76.19
Threshold consecutive trading days | trade_day				20	20
Threshold trading days | trade_day				23
Tangible equity units amount of units settled | Tangible_Equity_Unit		394	473
Shares of common stock issued (in shares)		781,000	939,000
Tangible equity units prepaid stock purchase contracts, outstanding units | Tangible_Equity_Unit						677
Equity Component | Common Class A
Debt Instrument [Line Items]
Threshold stock price (in dollars per share) | $ / shares				$ 50.40
Debt instrument convertible reference price (in dollars per share) | $ / shares				$ 42.00
Equity Component | Minimum | Common Class A
Debt Instrument [Line Items]
Convertible, number of equity instruments per contract (in shares)		1.9841	1.9841	1.9841	1.9841
Equity Component | Maximum | Common Class A
Debt Instrument [Line Items]
Convertible, number of equity instruments per contract (in shares)				2.3810	2.3810
Subsequent Event | Equity Component
Debt Instrument [Line Items]
Convertible, number of equity instruments per contract (in shares)	1.9841
Tangible equity units amount of units settled | Tangible_Equity_Unit	283
Shares of common stock issued (in shares)	560,000