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Restructuring and Other Charges (Additional Information) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) employee | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net | $ 9 | $ (1,627) | $ (45,464) | $ (1,846) |  |
Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Sublease Income Assumed | 13,700 |  | 13,700 |  |  |
Committed Sublease Income | 1,400 |  | 1,400 |  |  |
Uncommitted Sublease Income | 12,300 |  | 12,300 |  |  |
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 12,100 | 1,600 | 12,100 | 1,600 |  |
Other Noncurrent Liabilities [Member] | Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Reserve | 16,300 | 1,100 | 16,300 | 1,100 |  |
Restructuring Plan 2019 [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | $ (16,000) |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | employee |  |  | 240 |  |  |
Prior Year Plans [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | $ (100) |  |  |
2016 and 2019 Restructuring Plans [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | (42,962) |  |  |
Restructuring Reserve | 28,771 |  | 28,771 |  | $ 2,415 |
2016 and 2019 Restructuring Plans [Member] | Employee severance and related benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | (15,719) |  |  |
Restructuring Reserve | 328 |  | 328 |  | 0 |
2016 and 2019 Restructuring Plans [Member] | Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | (27,243) |  |  |
Restructuring Reserve | 28,443 |  | 28,443 |  | 2,415 |
Gross Lease Commitments | 42,100 |  | 42,100 |  |  |
Prior Headquarters Relocation Charge [Member] | Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  | (2,500) | (2,900) |  |
Restructuring Plan 2016 [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  |  | 1,014 |  |
Restructuring Reserve |  | 2,716 |  | 2,716 |  | $ 6,244
Restructuring Plan 2016 [Member] | Employee severance and related benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  |  | 509 |  |
Restructuring Reserve |  | 0 |  | 0 |  | 1,736
Restructuring Plan 2016 [Member] | Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net |  |  |  | 505 |  |
Restructuring Reserve |  | $ 2,716 |  | 2,716 | $ 2,400 | $ 4,508
Prior Headquarters [Member] | Facility closures and related costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and other charges, net | $ (400) |  | (27,100) |  |  |
Depreciation |  |  | 1,900 | $ 2,900 |  |
Payments for Rent |  |  | $ 600 |  |  |

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