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Leases - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 27, 2020 | Jun. 30, 2021 | Jun. 27, 2020 | Sep. 30, 2020 | Feb. 28, 2019
Lessee Lease Description [Line Items] |  |  |  |  |  |
Payments to be received as sublease income |  |  |  |  |  | $ 9,100
Operating lease not commenced, future lease payments | $ 5,700 |  | $ 5,700 |  |  |
Operating right-of-use lease assets | 147,431 |  | 147,431 |  | $ 149,933 |
Operating lease, liability | 203,133 |  | 203,133 |  |  |
Lease Cost |  |  |  |  |  |
Operating cash flows from operating leases | 12,319 | $ 12,127 | 40,396 | $ 27,267 |  |
Facility Closures and Related Costs |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating lease liability, net restructured facilities | 4,000 |  | 4,000 |  | $ 11,300 |
Operating right-of-use lease assets | 1,500 |  | 1,500 |  |  |
Operating lease, liability | 5,500 |  | 5,500 |  |  |
Lease Cost |  |  |  |  |  |
Operating cash flows from operating leases | 1,200 | $ 4,600 | 7,500 | $ 9,100 |  |
Facility Closures and Related Costs | Operating Lease Short Term Lease Obligation |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating lease, liability | 4,000 |  | 4,000 |  |  |
Facility Closures and Related Costs | Operating Lease Long Term Lease Obligation |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating lease, liability | 1,500 |  | 1,500 |  |  |
Sublease Income Committed |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Sublease income assumed | $ 1,500 |  | $ 1,500 |  |  |
Minimum |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating leases not yet commenced, term | 2 years |  | 2 years |  |  |
Maximum |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating leases not yet commenced, term | 13 years |  | 13 years |  |  |

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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