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Segment Information - Depreciation by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Consolidated depreciation expense	$ 111,512	$ 108,703	$ 118,776
Cost of Sales
Segment Reporting Information [Line Items]
Consolidated depreciation expense	110,009	106,013	114,125
Operating Segments | Cost of Sales | U.S. Gas
Segment Reporting Information [Line Items]
Consolidated depreciation expense	42,802	45,213	45,895
Operating Segments | Cost of Sales | Canadian Operations
Segment Reporting Information [Line Items]
Consolidated depreciation expense	5,792	6,206	5,954
Operating Segments | Cost of Sales | Union Electric
Segment Reporting Information [Line Items]
Consolidated depreciation expense	29,839	27,880	35,108
Operating Segments | Cost of Sales | Non-Union Electric
Segment Reporting Information [Line Items]
Consolidated depreciation expense	$ 31,576	$ 26,714	$ 27,168

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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