v3.26.1
Segment Information - Depreciation by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Segment Reporting [Line Items]        
Consolidated depreciation expense     $ 54,747 $ 55,096
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold        
Segment Reporting [Line Items]        
Consolidated depreciation expense $ 27,000 $ 27,166 53,970 54,351
Operating Segments | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | U.S. Gas        
Segment Reporting [Line Items]        
Consolidated depreciation expense 9,903 10,633 19,882 21,790
Operating Segments | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | Canadian Operations        
Segment Reporting [Line Items]        
Consolidated depreciation expense 1,580 1,442 3,272 2,874
Operating Segments | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | Union Electric        
Segment Reporting [Line Items]        
Consolidated depreciation expense 7,618 7,360 14,998 14,638
Operating Segments | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | Non-Union Electric        
Segment Reporting [Line Items]        
Consolidated depreciation expense $ 7,899 $ 7,731 $ 15,818 $ 15,049