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Significant Accounting Policies (Details) | Mar. 02, 2021 | Sep. 26, 2025 | Sep. 27, 2024
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PA Consulting Employees |  |  |
Significant Accounting Policies [Line Items] |  |  |
Ownership interest of employees | 35.00% | 71.00% | 70.00%
Preferred stock cumulative dividend rate | 12.00% |  |
Preferred stock redemption period | 5 years |  |
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Term of lease contract |  | 1 year |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Term of lease contract |  | 18 years |
Buildings |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of assets |  | 40 years |
Equipment | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of assets |  | 3 years |
Equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of assets |  | 10 years |
Leasehold improvements | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of assets |  | 1 year |
Leasehold improvements | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of assets |  | 13 years |

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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