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Stockholders' Equity (Employee Stock Benefit Plans) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 65,200 |  |
Options outstanding (in shares) | 400 | 1,300 |
Shares available for grant (in shares) | 11,000 |  |
Employee Contributions To ESPP | 10.00% |  |
Weighted average grant fair value, grants in period | $ 24.49 | $ 21.74 | $ 68.32
Capitalized stock based compensation | $ 10.6 | $ 4.7 | $ 2.9
Share-based compensation | $ 156.6 | $ 80.1 | $ 107.8
Director Long Term Incentive Plan 2008 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 1,500 |  |
Shares available for grant (in shares) | 600 |  |
Stock Compensation Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 19,400 |  |
Options outstanding (in shares) | 400 |  |
Shares available for grant (in shares) | 10,400 |  |
Equity incentive plan performance shares maximum vesting period | 3 years |  |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 11,600 |  |
ESPP shares issued (in shares) | 300 | 300 | 200
Shares available for grant (in shares) | 1,800 |  |
Percent of market price | 85.00% |  |
Share-based compensation | $ 6.6 | $ 5.8 | $ 5.2
Unrecognized Compensation Cost for unvested awards | $ 3.1 |  |
Weighted average remaining recognition period (in years) | 4 months |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized Compensation Cost for unvested awards | $ 170.7 |  |
Weighted average remaining recognition period (in years) | 1 year 7 months 6 days |  |
Restricted Stock [Member] | Director Long Term Incentive Plan 2008 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Restricted Stock [Member] | Long Term Incentive Plan 2015 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized Compensation Cost for unvested awards | $ 0.3 |  |
Weighted average remaining recognition period (in years) | 6 months |  |
Stock Options [Member] | Director Long Term Incentive Plan 2008 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual life maximum | 10 years |  |
Vesting period | 4 years |  |
Stock Options [Member] | Long Term Incentive Plan 2015 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual life maximum | 7 years |  |
Vesting period | 4 years |  |
Performance Shares [Member] | Long Term Incentive Plan 2015 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 2 years |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=116856206&loc=d3e5070-113901 + Details
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