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DEBT - Narrative (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |

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