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Restructuring and Other Charges - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 28, 2019 USD ($) | Sep. 30, 2020 USD ($) Employee | Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and other charges, net | $ (247) | $ (14,034) |  |
Restructuring charges | (131) | (13,758) |  |
Restructuring Reserve | 6,752 | 27,606 | $ 9,987 | $ 31,086
Impairment and Accretion Exited Lease Facilities |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges, exited facilities | (100) |  |  |
Prior Headquarters Relocation Charge |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring and other charges, net |  | (200) |  |
Employee Severance and Related Benefits |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges | (160) | (13,631) |  |
Restructuring Reserve | 1,461 | 14,027 | 3,992 | 298
Employee Severance and Related Benefits | Restructuring Plan 2020 |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges | (200) |  | $ (30,800) |
Number of employees | Employee |  |  | 250 |
Facility Closures |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges | 29 | (127) |  |
Restructuring Reserve | 5,291 | $ 13,579 | $ 5,995 | $ 30,788
Facility Closures | Accrued Expenses and Other Current Liabilities |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring Reserve | 2,700 |  |  |
Facility Closures | Other Noncurrent Liabilities |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring Reserve | $ 2,600 |  |  |

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