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Common stock, stock option plans and stock compensation agreements - Schedule Valuation Assumptions (Details)
12 Months Ended
Dec. 29, 2024
Dec. 31, 2023
Jan. 01, 2023
Weighted average assumptions of fair value of options      
Risk-free rate 4.15% 3.74% 1.98%
Expected volatility 17.85% 17.69% 18.00%
Expected life (in years) 7 years 7 years 7 years
Expected dividend yield 3.10% 2.90% 2.70%