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Employee Pension and Profit Sharing Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 398.8 | $ 364.0 |
Settlement gains recognized in other comprehensive loss, before tax | 0.1 | 3.9 |
Actuarial losses recognized in other comprehensive loss, before tax | 32.9 | 22.2 |
Amortization of actuarial gains (losses) recognized as net periodic pension cost | 1.2 | 1.6 |
Net actuarial gain (loss) included in accumulated other comprehensive income (loss) to be recognized in next fiscal year | 1.8 |  |
Expected future employer contributions during fiscal year 2017 | $ 4.1 |  |
Equity Funds, Domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actual plan asset allocations | 35.00% |  |
Equity Funds, International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actual plan asset allocations | 65.00% |  |
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution cost recognized | $ 41.5 | 22.5 | $ 27.5
Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution cost recognized | $ 11.7 | $ 8.6 | $ 6.9
Minimum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target plan asset allocations | 0.00% |  |
Minimum | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target plan asset allocations | 70.00% |  |
Minimum | Real Estate and Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target plan asset allocations | 0.00% |  |
Maximum | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target plan asset allocations | 20.00% |  |
Maximum | Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target plan asset allocations | 100.00% |  |
Maximum | Real Estate and Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum target plan asset allocations | 10.00% |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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