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Restructuring and Other Charges (Additional Information) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) | Mar. 28, 2020 USD ($) | Mar. 30, 2019 USD ($) | Mar. 28, 2020 USD ($) | Mar. 30, 2019 USD ($) employee | Sep. 30, 2019 USD ($) employee | Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | $ (13,200) | $ (26,400) | $ (26,996) | $ (42,971) |  |
Total lease cost |  | 10,965 |  | 22,498 |  |  |
Restructuring Reserve |  | 24,668 | 32,238 | 24,668 | 32,238 | $ 31,086 | $ 2,415
Impairment and Accretion Exited Lease Facilities [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | (4,700) |  | (5,000) |  |  |
Accelerated Depreciation Planned Facility Exit [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  | (300) |  |  |
Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  | 4,362 | (26,937) |  |
Restructuring Reserve |  | 7,183 | 31,283 | 7,183 | 31,283 | 30,788 | 2,415
Employee severance and related benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  | (31,358) | (16,034) |  |
Restructuring Reserve |  | 17,485 | 955 | 17,485 | 955 | $ 298 | $ 0
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve |  | 2,600 | 12,400 | 2,600 | 12,400 |  |
Other Noncurrent Liabilities [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve |  | 4,600 | 18,900 | 4,600 | 18,900 |  |
Total Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | (18,200) | (27,000) | (32,300) | (45,500) |  |
Prior Headquarters Relocation Charge [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  | (600) | 4,400 | (2,500) |  |
Restructuring Plan 2020 [Member] | Employee severance and related benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  | (31,500) |  |  |
Number of employees | employee |  |  |  |  |  | 255 |
Restructuring Plan 2019 [Member] | Employee severance and related benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | $ 100 |  |  | $ (16,300) |  |
Number of employees | employee |  |  |  |  | 240 |  |
Prior Headquarters [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Depreciation |  |  |  |  | $ 1,900 |  |
Operating Leases, Rent Expense |  |  | $ 600 |  |  |  |
Accounting Standards Update 2016-02 | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
ASC 842 adoption | $ 16,500 |  |  | 16,462 |  |  |
Accounting Standards Update 2016-02 | Employee severance and related benefits |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
ASC 842 adoption |  |  |  | $ 0 |  |  |
Accounting Standards Update 2016-02 | Operating Lease ROU Asset [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
ASC 842 adoption | 7,600 |  |  |  |  |  |
Accounting Standards Update 2016-02 | Operating Lease Short Term Lease Obligation [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
ASC 842 adoption | 9,200 |  |  |  |  |  |
Accounting Standards Update 2016-02 | Operating Lease Long Term Lease Obligation [Member] | Facility closures and related costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
ASC 842 adoption | $ 14,900 |  |  |  |  |  |

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