Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	$ 500,666	$ 479,440	$ 1,447,947	$ 1,365,903
United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	467,606	451,179	1,363,316	1,287,403
Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	33,060	28,261	84,631	78,500
Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	299,916	276,251	847,426	788,899
Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	59,167	52,273	167,829	150,707
Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	7,059	27,389	62,046	42,291
Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	134,524	123,527	370,646	384,006
Utility
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	270,141	258,222	792,144	753,418
Utility | United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	251,360	243,063	747,099	711,110
Utility | Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	18,781	15,159	45,045	42,308
Utility | Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	176,420	157,355	508,626	467,811
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	3,213	18,436	35,012	27,646
Utility | Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	90,508	82,431	248,506	257,961
Residential and commercial
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	229,749	218,925	653,803	608,291
Residential and commercial | United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	215,470	205,823	614,217	572,099
Residential and commercial | Canada
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	14,279	13,102	39,586	36,192
Residential and commercial | Tree and plant care
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	124,022	118,779	340,110	321,197
Residential and commercial | Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	59,127	52,273	167,789	150,707
Residential and commercial | Storm damage services
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	3,846	8,953	27,034	14,645
Residential and commercial | Consulting and other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	42,754	38,920	118,870	121,742
All other
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	776	2,293	2,000	4,194
All other | United States
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	776	2,293	2,000	4,194
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	(526)	117	(1,310)	(109)
All other | Grounds maintenance
Disaggregation of revenue [Line Items]
Revenue from contracts with customers	40	0	40	0
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	$ 1,262	$ 2,176	$ 3,270	$ 4,303