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Restructuring and Other Charges - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 27, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 27, 2020 USD ($) | Sep. 30, 2020 USD ($) Employee | Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net | $ 132 | $ (62) | $ (584) | $ (32,338) |  |
Restructuring charges |  |  | (345) | (26,764) |  |
Restructuring Reserve | 4,154 | 16,084 | 4,154 | 16,084 | $ 9,987 | $ 31,086
Impairment and Accretion Expense Related to Exited 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 |  |  |  | (600) |  |
Employee Severance and Related Benefits |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | (162) | (31,155) |  |
Restructuring Reserve | 262 | 9,728 | 262 | 9,728 | 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 and Related Costs |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | (183) | 4,391 |  |
Restructuring Reserve | 3,892 | $ 6,356 | 3,892 | $ 6,356 | $ 5,995 | $ 30,788
Facility Closures and Related Costs | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 2,400 |  | 2,400 |  |  |
Facility Closures and Related Costs | Other Noncurrent Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 1,500 |  | $ 1,500 |  |  |

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