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Employee Stock and Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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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 |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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