Employee Stock and Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Maximum permitted contribution to Employee Stock Purchase Plan, percent	10.00%
Discounted stock purchase price, percent of market value	95.00%
Number of shares issued under plan	0.5
Matching contributions	$ 132.7	$ 122.1	$ 111.7
Stock Options and Restricted Stock Units [Member]
Common stock available for issuance	46.5
Employee Stock [Member]
Common stock available for issuance	11.9
Stock Options [Member]
Award expiration period (years)	10 years
Total unrecognized stock-based compensation expense, net of estimated forfeitures	$ 1.0
Weighted average recognition period for total unrecognized stock-based compensation expense (in years)	1 year
Total intrinsic value of stock options exercised	$ 236.0	466.0	236.0
Total fair value of options vested	25.0	$ 31.0	$ 53.0
Restricted Stock Units (RSUs) [Member]
Total unrecognized stock-based compensation expense, net of estimated forfeitures	$ 134.0
Weighted average recognition period for total unrecognized stock-based compensation expense (in years)	1 year 10 months 24 days
Granted, weighted average grant date fair value per share	$ 81.96	$ 68.14	$ 56.48
Total fair value of RSUs vested	$ 211.0	$ 255.0	$ 166.0
Director [Member] \| Stock Options [Member] \| Maximum [Member]
Award vesting period for non-employee directors (years)	1 year

Aggregate number of common shares reserved for future issuance.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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