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Leases - Supplemental Balance Sheet Information (Details) - USD ($) | Sep. 26, 2020 | Sep. 29, 2019 | Sep. 28, 2019
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Lessee, Lease, Description [Line Items] |  |  |
Operating lease, right-of-use assets | $ 80,700,000 | $ 91,700,000 | $ 0
Operating lease liabilities (current) | $ 23,500,000 |  | 0
Finance lease liabilities (current) |  |  | $ 1,800,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent |  | us-gaap:OtherLiabilitiesNoncurrent
Operating lease liabilities (non-current) | $ 65,600,000 |  | $ 0
Finance lease liabilities (non-current) |  |  | $ 19,200,000
Operating leases, weighted average remaining lease term | 5 years 6 months 29 days |  |
Finance leases, weighted average remaining lease term | 7 years 7 months 20 days |  |
Operating leases, weighted average discount rate | 2.00% |  |
Finance leases, weighted average discount rate | 5.10% |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssets |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent |  | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Other assets |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease, right-of-use assets | $ 80,700 |  |
Accrued expenses |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liabilities (current) | 23,500 |  |
Other long-term liabilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liabilities (non-current) | 65,600 |  |
Finance lease obligations - short term |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Finance lease liabilities (current) | 1,900 |  |
Finance lease obligations - long term |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Finance lease liabilities (non-current) | $ 17,400 |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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