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Restructuring and Other Charges (Additional Information) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($) employee | Sep. 30, 2019 USD ($) employee | Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other charges, net | $ 14,034 | $ 18,493 |  |
Restructuring charges | 13,758 | 16,586 |  |
Total lease cost | 11,533 |  |  |
Restructuring Reserve | 27,606 | 10,691 | $ 31,086 | $ 2,415
Facility Impairment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 200 |  |  |
Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 127 | 243 |  |
Total lease cost | 2,400 |  |  |
Restructuring Reserve | 13,579 | 2,335 | 30,788 | 2,415
Employee severance and related benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 13,631 | 16,343 |  |
Restructuring Reserve | 14,027 | 8,356 | 298 | $ 0
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 4,700 | 1,300 |  |
Other Noncurrent Liabilities [Member] | Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 8,800 | 1,000 |  |
Restructuring Plan 2019 [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | $ 16,600 |  |
Restructuring Plan 2019 [Member] | Employee severance and related benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 16,300 |  |  |
Number of employees | employee |  | 240 |  |
2016 and 2019 Restructuring Plans [Member] | Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net Lease Commitments | 28,000 |  | $ 30,800 |
Gross Lease Commitments | 35,100 |  |  |
Committed Sublease Income | 3,700 |  |  |
Uncommitted Sublease Income | 3,400 |  |  |
Prior Headquarters Relocation Charge [Member] | Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | $ 1,900 |  |
Restructuring Plan 2020 [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total estimated restructuring charges FY20 | 30,000 |  |  |
Restructuring Plan 2020 [Member] | Employee severance and related benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 13,600 |  |  |
Number of employees | employee |  |  | 175 |
Total estimated restructuring charges FY20 | 21,000 |  |  |
Prior Headquarters [Member] | Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Depreciation |  | $ 1,900 |  |
Accounting Standards Update 2016-02 | Facility closures and related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
ASC 842 adoption | 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 |  |  |
Facility Impairment [Member] | Facility Impairment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 200 |  |  |

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