v3.22.4
Employee Benefit Plans - Amounts Recognized in Other Comprehensive (Gain) Loss (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Jan. 01, 2022
Jan. 02, 2021
Pension Benefits      
Amounts recognized in other comprehensive (income) loss:      
Net actuarial (gain) loss $ (2,785) $ (2,000) $ 1,728
Prior service credit 0 0 0
Amortization of prior year service credit 0 0 0
Amortization of loss (307) (428) (326)
Total amount recognized (3,092) (2,428) 1,402
Pension Benefits | Summit Materials, LLC      
Amounts recognized in other comprehensive (income) loss:      
Net actuarial (gain) loss (2,785) (2,000) 1,728
Prior service credit 0 0 0
Amortization of prior year service credit 0 0 0
Amortization of loss (307) (428) (326)
Total amount recognized (3,092) (2,428) 1,402
Healthcare & Life Ins      
Amounts recognized in other comprehensive (income) loss:      
Net actuarial (gain) loss (1,454) 1,143 675
Prior service credit (2,013) 0 0
Amortization of prior year service credit 296 241 241
Amortization of loss (218) (259) (89)
Total amount recognized (3,389) 1,125 827
Healthcare & Life Ins | Summit Materials, LLC      
Amounts recognized in other comprehensive (income) loss:      
Net actuarial (gain) loss (1,454) 1,143 675
Prior service credit (2,013) 0 0
Amortization of prior year service credit 296 241 241
Amortization of loss (218) (259) (89)
Total amount recognized $ (3,389) $ 1,125 $ 827