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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 28, 2025
Employee Retirement Plans [Abstract]  
Schedule of Costs of Retirement Plans [Table Text Block]
The following table summarizes the company's net periodic pension benefit related to the AGA Group pension plans (in thousands):
Three Months EndedSix Months Ended
Jun 28, 2025Jun 29, 2024Jun 28, 2025Jun 29, 2024
Net Periodic Pension Benefit:  
Interest cost$12,173 $10,809 $23,734 $21,589 
Expected return on assets(14,605)(15,340)(28,476)(30,637)
Amortization of net loss16 13 30 26 
Amortization of prior service cost703 660 1,371 1,319 
 $(1,713)$(3,858)$(3,341)$(7,703)