Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Revenue Recognition (Details) - USD ($) $ in Thousands	Oct. 03, 2026	Sep. 27, 2025	Oct. 03, 2026	Sep. 27, 2025
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ 522,668	$ 500,666	$ 1,477,376	$ 1,447,947
United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	488,296	467,606	1,389,996	1,363,316
Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	34,372	33,060	87,380	84,631
Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	316,153	299,916	879,880	847,426
Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	59,147	59,167	171,651	167,829
Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	9,745	7,059	28,892	62,046
Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	137,623	134,524	396,953	370,646
Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	283,395	270,141	812,939	792,144
Utility \| United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	264,085	251,360	764,800	747,099
Utility \| Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	19,310	18,781	48,139	45,045
Utility \| Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	187,620	176,420	532,376	508,626
Utility \| Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Utility \| Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	1,309	3,213	11,610	35,012
Utility \| Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	94,466	90,508	268,953	248,506
Residential and commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	241,241	229,749	664,227	653,803
Residential and commercial \| United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	226,179	215,470	624,986	614,217
Residential and commercial \| Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	15,062	14,279	39,241	39,586
Residential and commercial \| Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	128,994	124,022	348,977	340,110
Residential and commercial \| Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	59,147	59,127	171,651	167,789
Residential and commercial \| Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	8,436	3,846	17,282	27,034
Residential and commercial \| Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	44,664	42,754	126,317	118,870
All other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	(1,968)	776	210	2,000
All other \| United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	(1,968)	776	210	2,000
All other \| Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other \| Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	(461)	(526)	(1,473)	(1,310)
All other \| Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	40	0	40
All other \| Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All other \| Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ (1,507)	$ 1,262	$ 1,683	$ 3,270