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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 01, 2021 | Oct. 02, 2020 | Sep. 27, 2019 | Apr. 02, 2021 | Mar. 02, 2021 | Sep. 28, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowance | $ 188,662 | $ 140,578 |  |  |  |
Change in deferred tax asset valuation | 48,100 |  |  |  |  |
Change in deferred tax assets valuation allowance, amount | 38,928 | 0 | $ (207) |  |  |
Net operating losses | 197,929 | 197,987 |  |  |  |
Gross unrecognized tax benefits | 113,633 | 102,484 | 104,355 |  |  | $ 179,140
Unrecognized tax benefits | 113,633 | 102,484 | 104,355 |  |  | $ 179,140
Unrecognized tax benefits that would impact effective tax rate | 84,700 |  |  |  |  |
Accrued interest and penalties | 41,600 | 40,400 |  |  |  |
Decrease in unrecognized tax benefits | 5,500 |  |  |  |  |
Tax Rate Change | 25,588 | (6,811) | $ 0 |  |  |
Settlement with Taxing Authority |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Decrease in unrecognized tax benefits | 15,400 |  |  |  |  |
Accounting Standards Update 2013-11 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Gross unrecognized tax benefits | 91,900 | 93,400 |  |  |  |
Unrecognized tax benefits | 91,900 | 93,400 |  |  |  |
Accounting Standards Update 2013-11 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Gross unrecognized tax benefits | 21,700 | 9,100 |  |  |  |
Unrecognized tax benefits | 21,700 | 9,100 |  |  |  |
PA Consulting |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Change in deferred tax assets valuation allowance, amount | 4,600 |  |  |  |  |
PA Consulting Group Limited |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  |  |  |  | 65.00% |
Canada |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Undistributed earnings of foreign subsidiaries |  |  |  | $ 4,400 |  |
India |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Undistributed earnings of foreign subsidiaries |  |  |  | $ 7,700 |  |
Foreign Country |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Loss carry forwards of foreign subsidiaries | 760,400 | $ 783,900 |  |  |  |
Foreign Country | Her Majesty's Revenue and Customs (HMRC) |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax Rate Change | 25,600 |  |  |  |  |
Foreign Country | United Kingdom |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Change in deferred tax assets valuation allowance, amount | 3,500 |  |  |  |  |
United States Federal Tax Authority |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Change in deferred tax assets valuation allowance, amount | 27,400 |  |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Operating loss carryforwards valuation allowance | 11,700 |  |  |  |  |
Expiring Between 2022 and 2031 | Foreign Country |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Loss carry forwards of foreign subsidiaries | 87,700 |  |  |  |  |
Current Year Activity |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Change in deferred tax assets valuation allowance, amount | $ 900 |  |  |  |  |

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