INDEBTEDNESS - Narrative (Details) € in Millions				3 Months Ended			6 Months Ended
INDEBTEDNESS - Narrative (Details) € in Millions	Oct. 02, 2024 USD ($)	Dec. 15, 2023 USD ($)	Apr. 20, 2022 USD ($)	Jun. 28, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 28, 2024 USD ($)	Jun. 28, 2025 USD ($)	Jun. 29, 2024 USD ($)	Dec. 15, 2024 USD ($)	Sep. 17, 2024 USD ($)	Sep. 17, 2024 EUR (€)	Jun. 16, 2024	Jun. 15, 2024
Debt Instrument [Line Items]
Payments on long-term debt							$ 17,600,000	$ 19,600,000
Outstanding balance				$ 0	$ 0		$ 0
Domestic Line of Credit
Debt Instrument [Line Items]
Secured net leverage ratio, maximum				3.00			3.00
Maximum leverage ratio, subject to consummation of qualifying acquisitions							3.25
6.125% Notes due 2032
Debt Instrument [Line Items]
Face amount of debt										$ 715,000,000
Interest rate, stated percentage				6.125%			6.125%			6.125%	6.125%
5.375% Notes due 2032
Debt Instrument [Line Items]
Face amount of debt \| €											€ 350.0
Interest rate, stated percentage				5.375%			5.375%			5.375%	5.375%
4.375% Notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	4.375%
Redemption of debt	$ 700,000,000
(Gain) loss on extinguishment of debt					1,600,000	$ 5,100,000
2022 Revolver
Debt Instrument [Line Items]
Borrowings outstanding				$ 0	$ 0		$ 0
2022 Revolver \| Secured Debt \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,000,000,000
Term of debt			5 years
New Term Loan A Facility
Debt Instrument [Line Items]
Principal repayments				8,800,000			17,600,000
New Term Loan A Facility \| Secured Debt \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 500,000,000
Term of debt			5 years
New Term Loan B Facility
Debt Instrument [Line Items]
Principal repayments				$ 8,800,000			$ 17,600,000
New Term Loan B Facility \| Secured Debt \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,100,000,000
Term of debt			7 years
Incremental Term B Loans \| Secured Debt
Debt Instrument [Line Items]
Face amount of debt		$ 300,000,000
Senior Notes Due 2024 \| Senior Notes
Debt Instrument [Line Items]
Face amount of debt		$ 300,000,000
Interest rate, stated percentage		3.90%
Payments on long-term debt		$ 295,100,000
June 1, 2022 Through April 1, 2029 \| Secured Debt
Debt Instrument [Line Items]
Face amount of debt									$ 984,700,000
5.300% Notes due 2043
Debt Instrument [Line Items]
Interest rate, stated percentage				5.30%			5.30%
4.900% Notes due 2030
Debt Instrument [Line Items]
Interest rate, stated percentage				4.90%			4.90%					4.90%	4.65%
4.900% Notes due 2044
Debt Instrument [Line Items]
Interest rate, stated percentage				4.90%			4.90%

PERRIGO Co plc 10-Q