DEBT - Narrative (Details)						1 Months Ended	3 Months Ended
	Oct. 15, 2025 USD ($)	Jul. 26, 2023 USD ($)	Nov. 30, 2021 USD ($)	Jun. 16, 2021 EUR (€)	Apr. 21, 2021 USD ($)	Jul. 31, 2023 USD ($)	Sep. 30, 2025 USD ($) fiscalQuarter	Sep. 30, 2024 USD ($)	Oct. 17, 2025 USD ($)	Oct. 17, 2025 EUR (€)	Sep. 30, 2025 EUR (€) fiscalQuarter	Jun. 30, 2025 USD ($)	May 30, 2024 EUR (€)	Sep. 19, 2023 EUR (€)	Jul. 31, 2023 EUR (€)
Debt Instrument [Line Items]
Short-term debt							$ 0					$ 0.0
Long-term debt							4,061,200,000
Debt discount capitalized							0	$ 0
Line of Credit
Debt Instrument [Line Items]
Deferred financing fees write-offs							$ 0	0
Total net leverage ratio, material acquisition, number of fiscal quarters | fiscalQuarter							4				4
Total net leverage ratio, after material acquisition | fiscalQuarter							2				2
Line of Credit | Maximum
Debt Instrument [Line Items]
Applicable leverage ratio following the closing of any material acquisition							5.95
Line of Credit | Minimum
Debt Instrument [Line Items]
Applicable leverage ratio following the closing of any material acquisition							1.00
2031 Senior Notes | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, face amount	$ 900,000,000.0
Interest rate, stated percentage	5.60%
Proceeds from issuance of senior long-term debt	$ 888,000,000.0
2026 Dollar Senior Secured Notes due April 2026 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, face amount					$ 900,000,000.0
Interest rate, stated percentage					5.00%
Proceeds from issuance of senior long-term debt					$ 900,000,000.0
Long-term debt							$ 350,000,000.0					350,000,000.0
Debt instrument, early redemption premium, percent of outstanding principal amount							1.00%
Debt instrument, base redemption price, percentage							100.00%
2026 Dollar Senior Secured Notes due April 2026 | Senior Notes | Bund Rate
Debt Instrument [Line Items]
Basis spread on variable rate, percentage							0.50%
2026 Dollar Senior Secured Notes | Senior Notes
Debt Instrument [Line Items]
Long-term debt							$ 300,000,000.0	$ 250,000,000.0
2026 Dollar Senior Secured Notes | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Long-term line of credit									$ 350,000,000.0
2026 Euro Senior Secured Notes due April 2026 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, face amount | €				€ 700,000,000
Interest rate, stated percentage				3.875%
Proceeds from issuance of senior long-term debt | €				€ 700,000,000
Long-term debt							$ 820,300,000				€ 700,000,000.0	820,000,000.0
Debt instrument, early redemption premium, percent of outstanding principal amount							1.00%
Debt instrument, base redemption price, percentage							100.00%
2026 Euro Senior Secured Notes due April 2026 | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Long-term debt									$ 520,000,000.0	€ 450,000,000
2026 Euro Senior Secured Notes due April 2026 | Senior Notes | US Treasury (UST) Interest Rate
Debt Instrument [Line Items]
Basis spread on variable rate, percentage							0.50%
2029 Dollar Senior Secured Notes due January 2029 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, face amount			$ 500,000,000.0
Interest rate, stated percentage			4.75%
Proceeds from issuance of senior long-term debt			$ 500,000,000.0
Long-term debt							$ 500,000,000.0					500,000,000.0
Debt instrument, early redemption premium, percent of outstanding principal amount							1.00%
Debt instrument, base redemption price, percentage							100.00%
2029 Dollar Senior Secured Notes due January 2029 | Senior Notes | US Treasury (UST) Interest Rate
Debt Instrument [Line Items]
Basis spread on variable rate, percentage							0.50%
2030 Dollar Senior Secured Notes, due April 2030 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, face amount		$ 750,000,000.0
Interest rate, stated percentage		6.625%
Proceeds from issuance of senior long-term debt		$ 740,600,000
2028 Euro Senior Secured Notes Due January 2028
Debt Instrument [Line Items]
Debt Instrument, face amount | €														€ 493,800,000
2028 Euro Senior Secured Notes Due January 2028 | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, face amount | €														€ 500,000,000
Interest rate, stated percentage														5.75%
2027 Euro Senior Secured Notes
Debt Instrument [Line Items]
Debt Instrument, face amount | €													€ 493,700,000
2027 Euro Senior Secured Notes | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, face amount | €													€ 500,000,000
Interest rate, stated percentage													4.50%
2028 Euro Senior Secured Notes due September 2028 | Senior Notes
Debt Instrument [Line Items]
Long-term debt							$ 586,000,000.0					585,700,000
Debt instrument, early redemption premium, percent of outstanding principal amount							1.00%
Debt instrument, base redemption price, percentage							100.00%
2028 Euro Senior Secured Notes due September 2028 | Senior Notes | US Treasury (UST) Interest Rate
Debt Instrument [Line Items]
Basis spread on variable rate, percentage							0.50%
2030 Dollar Senior Secured Notes due July 2030 | Senior Notes
Debt Instrument [Line Items]
Long-term debt							$ 750,000,000.0					750,000,000.0
Debt instrument, early redemption premium, percent of outstanding principal amount							1.00%
Debt instrument, base redemption price, percentage							100.00%
2030 Dollar Senior Secured Notes due July 2030 | Senior Notes | US Treasury (UST) Interest Rate
Debt Instrument [Line Items]
Basis spread on variable rate, percentage							0.50%
2018 Coty Term A Facility
Debt Instrument [Line Items]
Aggregate principal amount | €															€ 2,035,000,000
2018 Coty Term A Facility | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,000,000,000
2018 Coty Term B Facility
Debt Instrument [Line Items]
Aggregate principal amount | €															850,000,000.0
2018 Coty Term B Facility | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,400,000,000
2018 Coty Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Credit spread adjustment						0.10%
2018 Coty Credit Agreement | Line of Credit | Refinancing in Dollars and Certain Other Currencies
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,670,000,000
2018 Coty Credit Agreement | Line of Credit | Refinancing in Euros
Debt Instrument [Line Items]
Aggregate principal amount | €															€ 300,000,000
Letter of Credit
Debt Instrument [Line Items]
Undrawn letters of credit and bank guarantees							$ 3,100,000					3,100,000
Letter of Credit | 2023 Coty Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount						150,000,000.0
Bank Guarantee
Debt Instrument [Line Items]
Undrawn letters of credit and bank guarantees							$ 16,400,000					$ 16,000,000.0
Swingline loans | 2023 Coty Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount						150,000,000.0
Incurrence Incremental Facilities | 2023 Coty Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,700,000,000
Net leverage ratio						3.00