CREDIT ARRANGEMENTS AND DEBT OBLIGATIONS - Senior Secured Credit Facilities (Details) € in Millions, £ in Millions						1 Months Ended				12 Months Ended
	Aug. 21, 2025 USD ($)	Apr. 17, 2025 USD ($)	Apr. 16, 2025 USD ($)	Dec. 11, 2024	Dec. 10, 2024	Aug. 31, 2025 USD ($)	May 31, 2025 USD ($)	Feb. 28, 2025 USD ($)	Jan. 31, 2025	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 EUR (€)	Dec. 31, 2025 GBP (£)	Dec. 31, 2025 AUD ($)	Aug. 20, 2025	Dec. 31, 2024 AUD ($)
Debt Instrument [Line Items]
Repayment of debt										$ 501,000,000	$ 17,000,000	$ 16,000,000
Debt expense											800,000
Debt issuance, weighted average interest rate										5.59%			5.59%	5.59%	5.59%
Letters of credit outstanding, amount										$ 0	$ 15,200,000
Secured Term Loan
Debt Instrument [Line Items]
Effective interest rate for the term loans										5.47%	6.21%		5.47%	5.47%	5.47%		6.21%
Debt issuance, weighted average interest rate										5.99%	7.25%	7.19%	5.99%	5.99%	5.99%		7.25%
Term Loan A \| Secured Term Loan
Debt Instrument [Line Items]
Repayment of debt		$ 362,500,000
Debt expense		$ 600,000
Term Loan A \| Secured Term Loan \| Quarterly Payment Rate for First Three Years
Debt Instrument [Line Items]
Percentage of periodic payment		2.50%
Term Loan A \| Secured Term Loan \| Payment Rate in Year Four
Debt Instrument [Line Items]
Percentage of periodic payment		5.00%
Term Loan A \| Secured Term Loan \| Payment Rate in Year Five
Debt Instrument [Line Items]
Percentage of periodic payment		7.50%
Term Loan A \| Secured Term Loan \| Bank Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Term Loan A \| Secured Term Loan \| Bank Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Term Loan A \| Secured Term Loan \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Term Loan A \| Secured Term Loan \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Term Loan A \| Secured Term Loan \| SOFR Floor
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Term Loan B \| Secured Term Loan
Debt Instrument [Line Items]
Repayment of debt						$ 50,000,000.0	$ 39,000,000.0	$ 44,500,000
Debt instrument, basis spread on variable rate, reduction				0.0025					0.0025
Percentage of periodic payment																1.00%
Term Loan B \| Secured Term Loan \| Bank Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%			1.00%	1.25%				0.75%
Term Loan B \| Secured Term Loan \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%			2.00%	2.25%				1.75%
Term Loan B \| Secured Term Loan \| SOFR Floor
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%			0.50%
Term Loan B \| Secured Term Loan \| Federal Funds Rate And Overnight Bank Funding Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Term Loan B \| Secured Term Loan \| One-Month Term SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Term Loan B \| Secured Term Loan \| Interest Rate Floor
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Term Loan B \| Secured Term Loan \| Base Rate, Floor Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%		1.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 900,000,000	$ 400,000,000							$ 900,000,000
Repayment of debt	$ 50,000,000
Debt expense	1,900,000
Debt issuance costs, gross	$ 200,000	$ 2,900,000
Effective interest rate for the term loans										4.96%			4.96%	4.96%	4.96%
Debt issuance, weighted average interest rate										5.70%	7.81%	7.73%	5.70%	5.70%	5.70%		7.81%
Outstanding balance under revolving credit facility										$ 496,500,000	$ 0		€ 71.8	£ 31.4
Letters of credit outstanding, amount										20,200,000
Remaining borrowing capacity										383,700,000	384,800,000
Expected renewal balance										$ 300,000,000
Net leverage ratio										4.25
Revolving Credit Facility \| Bank Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.25%	0.50%
Revolving Credit Facility \| Bank Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%	0.75%
Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%	1.50%
Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%	1.75%
Revolving Credit Facility \| SOFR Floor
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Revolving Credit Facility \| Base Rate, Floor Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Revolving Credit Facility \| Euro Interbank Offered Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Revolving Credit Facility \| Euro Interbank Offered Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Revolving Credit Facility \| Euro Interbank Offered Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Revolving Credit Facility \| Sterling Overnight Index Average Rate, Floor
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Revolving Credit Facility \| Sterling Overnight Index Average Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.0326%
Revolving Credit Facility \| Sterling Overnight Index Average Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Revolving Credit Facility \| Sterling Overnight Index Average Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Revolving Credit Facility \| Revolving Credit Facility - USD Portion
Debt Instrument [Line Items]
Outstanding balance under revolving credit facility										$ 370,000,000.0
Uncommitted Working Capital Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity											3,300,000						$ 5,000,000
Debt issuance, weighted average interest rate										5.55%			5.55%	5.55%	5.55%
Outstanding balance under revolving credit facility										$ 3,000,000.0	$ 0				$ 4,500,000

BRIGHT HORIZONS FAMILY SOLUTIONS INC. 10-K