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Segment Information - Revenue, Gross Profit and Cost of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Consolidated revenue	$ 2,982,781	$ 2,637,229	$ 2,899,276
Consolidated gross profit	246,566	220,672	273,442
Consolidated cost of revenue	2,736,215	2,416,557	2,625,834
Operating Segments | U.S. Gas
Segment Reporting Information [Line Items]
Consolidated revenue	1,328,145	1,260,579	1,357,449
Consolidated gross profit	71,201	69,511	123,626
Consolidated cost of revenue	1,256,944	1,191,068	1,233,823
Operating Segments | Canadian Operations
Segment Reporting Information [Line Items]
Consolidated revenue	246,908	197,872	234,794
Consolidated gross profit	45,826	31,306	33,095
Consolidated cost of revenue	201,082	166,566	201,699
Operating Segments | Union Electric
Segment Reporting Information [Line Items]
Consolidated revenue	808,341	693,513	833,094
Consolidated gross profit	71,027	58,002	57,740
Consolidated cost of revenue	737,314	635,511	775,354
Operating Segments | Non-Union Electric
Segment Reporting Information [Line Items]
Consolidated revenue	599,387	485,265	473,939
Consolidated gross profit	58,512	61,853	58,231
Consolidated cost of revenue	540,875	423,412	415,708
Other
Segment Reporting Information [Line Items]
Consolidated gross profit	0	0	750
Consolidated cost of revenue	$ 0	$ 0	$ (750)

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