Segment Information - Revenue, Gross Profit and Cost of Revenue (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 revenue	$ 961,986	$ 724,052	$ 1,685,160	$ 1,274,133
Consolidated gross profit	69,142	67,801	104,900	88,129
Consolidated cost of revenue	892,844	656,251	1,580,260	1,186,004
Operating Segments \| U.S. Gas
Segment Reporting [Line Items]
Consolidated revenue	489,520	336,834	774,019	534,528
Consolidated gross profit	20,647	26,424	14,312	11,568
Consolidated cost of revenue	468,873	310,410	759,707	522,960
Operating Segments \| Canadian Operations
Segment Reporting [Line Items]
Consolidated revenue	81,438	55,111	141,466	94,895
Consolidated gross profit	13,042	9,485	22,142	16,564
Consolidated cost of revenue	68,396	45,626	119,324	78,331
Operating Segments \| Union Electric
Segment Reporting [Line Items]
Consolidated revenue	224,167	182,239	428,236	357,707
Consolidated gross profit	20,195	15,355	38,429	27,168
Consolidated cost of revenue	203,972	166,884	389,807	330,539
Operating Segments \| Non-Union Electric
Segment Reporting [Line Items]
Consolidated revenue	166,861	149,868	341,439	287,003
Consolidated gross profit	15,258	16,537	30,017	32,829
Consolidated cost of revenue	$ 151,603	$ 133,331	$ 311,422	$ 254,174

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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