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Restructuring and Other Charges - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 28, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 28, 2020 USD ($) | Sep. 30, 2020 USD ($) Employee | Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net | $ (469) | $ (18,242) | $ (716) | $ (32,276) |  |
Restructuring charges | (200) | (13,200) | (362) | (26,996) |  |
Restructuring Reserve | 4,973 | 24,668 | 4,973 | 24,668 | $ 9,987 | $ 31,086
Impairment and Accretion Expense Related to Exited Facilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net | (300) | (4,700) | (300) | (5,000) |  |
Accelerated Depreciation Planned Facility Exit |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  | (300) |  | (300) |  |
Employee Severance and Related Benefits |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | (163) | (31,358) |  |
Restructuring Reserve | 262 | 17,485 | 262 | 17,485 | 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 |  |  | (199) | 4,362 |  |
Restructuring Reserve | 4,711 | $ 7,183 | 4,711 | $ 7,183 | $ 5,995 | $ 30,788
Facility Closures and Related Costs | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 2,600 |  | 2,600 |  |  |
Facility Closures and Related Costs | Other Noncurrent Liabilities |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | $ 2,100 |  | $ 2,100 |  |  |

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