Equity (Components Of Accumulated Other Comprehensive Income, Net Of Tax) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (7,904.0)	$ (6,759.1)	$ (7,799.4)	$ (6,231.0)
Net gains/(losses) in AOCI, beginning of period	(364.6)
Other comprehensive income/(loss)	218.7	111.1
Net gains/(losses) in AOCI, end of period	(145.9)
Cumulative effect of adoption of new accounting guidance	(2.2)	17.3
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4.1	3.2	5.7	3.9
Net gains/(losses) recognized in OCI before reclassifications	(0.4)	(0.1)
Net (gains)/losses reclassified from AOCI to earnings	(1.2)	0.1
Other comprehensive income/(loss)	(1.6)	0.0
Cumulative effect of adoption of new accounting guidance		(0.7)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(75.5)	33.7	(82.1)	11.0
Net gains/(losses) recognized in OCI before reclassifications	4.8	25.8
Net (gains)/losses reclassified from AOCI to earnings	1.8	(6.1)
Other comprehensive income/(loss)	6.6	19.7
Cumulative effect of adoption of new accounting guidance		3.0
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(13.5)	7.7	11.5	(10.1)
Net gains/(losses) recognized in OCI before reclassifications	(22.6)	17.7
Net (gains)/losses reclassified from AOCI to earnings	(2.4)	(2.4)
Other comprehensive income/(loss)	(25.0)	15.3
Cumulative effect of adoption of new accounting guidance		2.5
Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(61.0)	(432.0)	(299.7)	(508.1)
Net gains/(losses) recognized in OCI before reclassifications	238.7	76.1
Net (gains)/losses reclassified from AOCI to earnings	0.0	0.0
Other comprehensive income/(loss)	238.7	76.1
Cumulative effect of adoption of new accounting guidance		0.0
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(7,909.7)	(6,759.9)	(7,805.1)	(6,232.2)
Other comprehensive income/(loss)	218.7	111.1
Cumulative effect of adoption of new accounting guidance	(2.2)	17.3
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(145.9)	(387.4)	$ (364.6)	$ (503.3)
Net gains/(losses) recognized in OCI before reclassifications	220.5	119.5
Net (gains)/losses reclassified from AOCI to earnings	(1.8)	(8.4)
Other comprehensive income/(loss)	218.7	111.1
Cumulative effect of adoption of new accounting guidance	$ 0.0	$ 4.8