Long-Term Debt - Additional Information (Details)					3 Months Ended		6 Months Ended		12 Months Ended
Long-Term Debt - Additional Information (Details)	Jul. 02, 2024 USD ($)	Apr. 30, 2024 USD ($)	Mar. 27, 2023	Jul. 22, 2022 USD ($) d	Jun. 29, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 29, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 29, 2024 USD ($)	Jul. 12, 2023 USD ($)	Apr. 04, 2021 USD ($)	Mar. 23, 2021 USD ($)
Debt Instrument [Line Items]
Interest and other non-operating expenses, net					$ 10,300,000	$ 9,000,000	$ 17,700,000	$ 15,700,000
Interest expense related to ABL facility and term loan facility					7,900,000	7,000,000.0	13,200,000	12,200,000
Amortization expense related to debt issuance costs					200,000	400,000	500,000	700,000
Interest expense incurred related to finance leases					2,200,000	$ 1,600,000	4,000,000.0	$ 2,800,000
Total gross long-term debt					474,500,000		474,500,000		$ 393,300,000
Long-term debt, current maturities					3,900,000		3,900,000		4,300,000
Total long-term debt					466,000,000.0		466,000,000.0		383,900,000
ABL facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 600,000,000.0
Remaining borrowing capacity under credit facility					$ 499,300,000		$ 499,300,000		$ 581,200,000
Debt instrument, possible reduction of basis spread variable rate				0.125%
Debt instrument, consolidated total leverage ratio				1.50
Commitment fee for the unfunded amount							0.25%		0.25%
Interest rate on credit facility					5.66805%		5.66805%
Outstanding balance under the ABL Facility									$ 0
Threshold trading days \| d				30
Fixed charges coverage ratio				1.00
Total gross long-term debt					$ 78,500,000		$ 78,500,000		0
ABL facility \| Subsidiary ABL facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 20,000,000.0
Debt instrument, possible reduction of basis spread variable rate		0.20%
Commitment fee for the unfunded amount		0.25%
Fixed charges coverage ratio		2.00
Total gross long-term debt					$ 5,300,000		$ 5,300,000		$ 200,000
ABL facility \| Minimum
Debt Instrument [Line Items]
Commitment fee for the unfunded amount				0.20%
ABL facility \| Minimum \| Subsidiary ABL facility
Debt Instrument [Line Items]
Interest rate on credit facility					6.22413%		6.22413%		6.65265%
ABL facility \| Maximum
Debt Instrument [Line Items]
Commitment fee for the unfunded amount				0.25%
ABL facility \| SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.10%
Debt instrument floor rate				0.00%
ABL facility \| SOFR \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.25%
ABL facility \| SOFR \| Minimum \| Subsidiary ABL facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.90%
ABL facility \| SOFR \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.50%
ABL facility \| SOFR \| Maximum \| Subsidiary ABL facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.10%
ABL facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.25%
ABL facility \| Base Rate \| Minimum \| Subsidiary ABL facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.80%
ABL facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.50%
ABL facility \| Base Rate \| Maximum \| Subsidiary ABL facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.00%
Term loans
Debt Instrument [Line Items]
Face amount of loan	$ 392,700,000									$ 120,000,000		$ 325,000,000.0
Interest rate					6.06134%		6.06134%		6.27397%
Quarterly payment as percentage of initial principal amount	0.25%
Percentage of excess cash flow to be paid for annual mandatory prepayments	50.00%
Threshold for mandatory annual prepayments	$ 24,000,000
Leverage ratio	3.00
Total gross long-term debt					$ 390,700,000		$ 390,700,000		$ 392,700,000
Term loans \| SOFR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%		2.00%
Debt instrument floor rate	0.50%		0.50%
Term loans \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%		1.00%
Other term loan \| SOFR
Debt Instrument [Line Items]
Debt instrument floor rate			0.00%
Hybrid debt instruments
Debt Instrument [Line Items]
Total gross long-term debt					$ 0		$ 0		$ 400,000		$ 5,900,000
Long-term debt, current maturities											1,500,000
Total long-term debt											$ 4,400,000

SiteOne Landscape Supply, Inc. 10-Q