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Restructuring and Other Charges - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 02, 2019 USD ($) | Dec. 28, 2018 USD ($) Employee | Sep. 30, 2020 USD ($) Employee | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | $ (32,716) | $ (51,114) | $ (3,764) |
Restructuring Charges |  |  | (26,427) | (48,612) | 1,003 |
Payments for restructuring |  |  | 31,502 | 24,721 | 2,756 |
Restructuring Reserve |  |  | 9,987 | 31,086 | 2,415 | $ 6,244
Depreciation |  |  | 24,700 | 26,700 | 29,400 |
Impairment and Accretion Exited Lease Facilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | (5,600) |  |  |
Accelerated Depreciation Planned Facility Exit |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | (700) |  |  |
Facility Closures |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  | 4,263 | (32,908) | 494 |
Payments for restructuring |  |  | 4,246 | 9,319 | 1,509 |
Restructuring Reserve |  |  | 5,995 | 30,788 | 2,415 | 4,508
Facility Closures | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve |  |  | 2,800 |  |  |
Facility Closures | Other Noncurrent Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve |  |  | 3,200 | 18,900 |  |
Facility Closures | Other Current Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve |  |  |  | 11,900 |  |
Facility Closures | Accounting Standards Update 2016-02 |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
ASC 842 adoption | $ 16,500 |  |  |  |  |
Facility Closures | Accounting Standards Update 2016-02 | Operating Lease ROU Asset |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
ASC 842 adoption | 7,600 |  |  |  |  |
Facility Closures | Accounting Standards Update 2016-02 | Operating Lease Short Term Lease Obligation |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
ASC 842 adoption | 9,200 |  |  |  |  |
Facility Closures | Accounting Standards Update 2016-02 | Operating Lease Long Term Lease Obligation |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
ASC 842 adoption | $ 14,900 |  |  |  |  |
Employee Severance and Related Benefits |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  | (30,690) | (15,704) | 509 |
Payments for restructuring |  |  | 27,256 | 15,402 | 1,247 |
Restructuring Reserve |  |  | 3,992 | 298 | 0 | $ 1,736
Prior Headquarters Relocation Charge |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | $ 4,300 |  |  |
Restructuring Charges |  |  |  | (32,700) |  |
Lease expiration, month and year |  |  | 2022-11 |  |  |
Restructuring Plan 2020 |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Payments for restructuring |  |  | $ 27,300 |  |  |
Restructuring Plan 2020 | Employee Severance and Related Benefits |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  | $ (30,800) |  |  |
Number of employees | Employee |  |  | 250 |  |  |
Restructuring Plan 2019 |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Payments for restructuring |  |  | $ 3,900 | 23,600 |  |
Restructuring Plan 2019 | Employee Severance and Related Benefits |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  | $ (16,300) | 100 |  |  |
Number of employees | Employee |  | 240 |  |  |  |
Restructuring Plan 2016 |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  |  |  | (200) |
Payments for restructuring |  |  | $ 300 | 1,100 | 2,600 |
2016 and 2019 Restructuring Plans |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  |  | (48,600) |  |
Prior Year Plans | Facility Closures |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  |  | (200) |  |
Prior Headquarters Relocation Charge | Facility Closures |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  |  | (2,500) |  |
Restructuring Plan 2015 |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  |  |  | (800) |
Payments for restructuring |  |  |  |  | 200 |
Prior Headquarters | Facility Closures |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Depreciation |  |  |  | 1,900 | $ 4,800 |
Payments for Rent |  |  |  | $ 600 |  |

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