Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Mar. 27, 2020	Dec. 27, 2019	Mar. 29, 2019	Dec. 28, 2018	Mar. 27, 2020	Mar. 29, 2019
Earnings Per Share [Abstract]
Net income	$ 181.1	$ 257.1	$ 214.0	$ 284.9	$ 438.1	$ 498.8
Weighted average shares outstanding - basic (shares)	170.0		173.8		170.1	175.2
Dilutive effect of equity based awards (shares)	1.1		0.8		1.2	0.9
Weighted average shares outstanding - diluted (shares)	171.1		174.6		171.3	176.1
Net income per share - basic (usd per share)	$ 1.07		$ 1.23		$ 2.58	$ 2.85
Net income per share - diluted (usd per share)	$ 1.06		$ 1.23		$ 2.56	$ 2.83
Anti-dilutive common stock equivalents (shares)	0.5		1.9		1.5	1.8