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PA Consulting Redeemable Noncontrolling Interests - Schedule of Change in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Redeemable noncontrolling interest, beginning balance | $ 17,836 |  |
Attribution of Preferred Dividend to Common Shareholders | (14,181) | $ (21,202) | $ (22,739)
Redeemable noncontrolling interest, ending balance | 7,098 | 17,836 |
PA Consulting Employees |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Redeemable noncontrolling interest, beginning balance | 820,182 | 632,979 |
Accrued Preferred Dividend to Preference Shareholders | 81,713 | 73,033 |
Attribution of Preferred Dividend to Common Shareholders | (81,713) | (73,033) |
Net earnings attributable to redeemable noncontrolling interest to Common Shareholders | 11,177 | 14,999 |
Redeemable Noncontrolling interests redemption value adjustment | 199,763 | 171,142 |
Repurchase of redeemable noncontrolling interests | (13,999) | (62,867) |
Issuance of redeemable noncontrolling interests | 0 | 22,586 |
Cumulative translation adjustment and other | 1,571 | 41,343 |
Redeemable noncontrolling interest, ending balance | $ 1,018,694 | $ 820,182 | $ 632,979

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