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Restructuring and Other Charges - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 02, 2019 USD ($) | Jun. 27, 2020 USD ($) | Jun. 29, 2019 USD ($) | Dec. 28, 2018 USD ($) Employee | Jun. 27, 2020 USD ($) Employee | Jun. 29, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and other charges, net |  | $ (62) | $ 9 |  | $ (32,338) | $ (45,464) |  |
Restructuring charges |  | 200 |  |  | (26,764) | (42,962) |  |
Restructuring Reserve |  | 16,084 | 28,771 |  | 16,084 | 28,771 | $ 31,086 | $ 2,415
Impairment and Accretion Exited Lease Facilities |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and other charges, net |  |  |  |  | (4,900) |  |  |
Accelerated Depreciation Planned Facility Exit |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and other charges, net |  | (300) |  |  | (600) |  |  |
Prior Headquarters Relocation Charge |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and other charges, net |  |  |  |  | $ 4,500 | (2,500) |  |
Lease expiration, month and year |  |  |  |  | 2022-11 |  |  |
Employee Severance and Related Benefits |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ (31,155) | (15,719) |  |
Restructuring Reserve |  | 9,728 | 328 |  | 9,728 | 328 | 298 | 0
Employee Severance and Related Benefits | Restructuring Plan 2020 |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ (31,300) |  |  |
Number of employees | Employee |  |  |  |  | 255 |  |  |
Employee Severance and Related Benefits | Restructuring Plan 2019 |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  | $ (16,300) | $ 200 |  |  |
Number of employees | Employee |  |  |  | 240 |  |  |  |
Facility Closures and Related Costs |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 4,391 | (27,243) |  |
Restructuring Reserve |  | 6,356 | 28,443 |  | 6,356 | 28,443 | $ 30,788 | $ 2,415
Facility Closures and Related Costs | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve |  | 2,600 | 12,100 |  | 2,600 | 12,100 |  |
Facility Closures and Related Costs | Other Noncurrent Liabilities |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve |  | $ 3,800 | $ 16,300 |  | $ 3,800 | 16,300 |  |
Facility Closures and Related Costs | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
ASC 842 adoption | $ 16,500 |  |  |  |  |  |  |
Facility Closures and Related Costs | Accounting Standards Update 2016-02 | Operating Lease ROU Asset |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
ASC 842 adoption | 7,600 |  |  |  |  |  |  |
Facility Closures and Related Costs | Accounting Standards Update 2016-02 | Operating Lease Short Term Lease Obligation |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
ASC 842 adoption | 9,200 |  |  |  |  |  |  |
Facility Closures and Related Costs | Accounting Standards Update 2016-02 | Operating Lease Long Term Lease Obligation |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
ASC 842 adoption | $ 14,900 |  |  |  |  |  |  |
Facility Closures and Related Costs | Prior Headquarters |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  | 1,900 |  |
Operating Leases, Rent Expense |  |  |  |  |  | $ 600 |  |

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