DEBT - Narrative (Details)			9 Months Ended		48 Months Ended	72 Months Ended
	Oct. 28, 2016 USD ($)	Jan. 26, 2016 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017	Sep. 30, 2021	Sep. 30, 2023	Jun. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)	Apr. 08, 2016 EUR (€)	Oct. 27, 2015 USD ($)	Oct. 27, 2015 EUR (€)
Debt Instrument [Line Items]
Debt issuance costs, net			$ 61,600,000				$ 67,600,000
Coty Term Loan B Facility due October 2022 | Euro Interbank Offered Rate (Euribor)
Debt Instrument [Line Items]
Basis spread on variable rate (percent)			2.75%
Line of Credit | Maximum
Debt Instrument [Line Items]
Applicable leverage ratio following the closing of any material acquisition		5.95	4.75
Line of Credit | Minimum
Debt Instrument [Line Items]
Applicable leverage ratio following the closing of any material acquisition		1.00
Line of Credit | Coty Term Loan A Facility due October 2020 | Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net			$ 27,300,000				33,200,000
Quarterly repayment percentage (percent)				1.25%
Line of Credit | Coty Term Loan B Facility due October 2022 | Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net			10,500,000				11,300,000
Quarterly repayment percentage (percent)				0.25%
Line of Credit | Galleria Term Loan A Facility due September 2021 | Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net			2,600,000				2,700,000
Line of Credit | Galleria Term Loan A Facility due September 2021 | Galleria | Term Loan
Debt Instrument [Line Items]
Amount of term loan facility		$ 2,000,000,000.0
Term of revolving credit facility (in years)		5 years
Long-term debt		$ 944,300,000
Line of Credit | Galleria Term Loan A Facility due September 2021 | Scenario, Forecast | Term Loan
Debt Instrument [Line Items]
Quarterly repayment percentage (percent)					1.25%
Line of Credit | Galleria Term Loan B Facility due September 2023 | Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net			$ 3,000,000				$ 3,000,000
Line of Credit | Galleria Term Loan B Facility due September 2023 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)			3.00%
Variable rate, minimum (percent)			0.75%
Line of Credit | Galleria Term Loan B Facility due September 2023 | Alternative Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)			2.00%
Variable rate, minimum (percent)			1.75%
Line of Credit | Galleria Term Loan B Facility due September 2023 | Galleria | Term Loan
Debt Instrument [Line Items]
Amount of term loan facility		$ 1,000,000,000.0
Discount percentage (percent)		0.50%
Term of revolving credit facility (in years)		7 years
Long-term debt		$ 995,000,000
Line of Credit | Galleria Term Loan B Facility due September 2023 | Scenario, Forecast | Term Loan
Debt Instrument [Line Items]
Quarterly repayment percentage (percent)						0.25%
Line of Credit | Galleria Revolving Credit Facility due September 2021 | Galleria | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,500,000,000.0
Term of revolving credit facility (in years)		5 years
Long-term debt		$ 0
Line of Credit | Galleria Revolving Credit Facility due September 2021 | Galleria | Assumed fees payable
Debt Instrument [Line Items]
Assumed fees payable		2,500,000
Line of Credit | Galleria Credit Agreement | Galleria
Debt Instrument [Line Items]
Long-term debt		$ 1,941,800,000
Line of Credit | Galleria Credit Agreement | Galleria | Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net								$ 11,400,000
Line of Credit | Coty Credit Agreement | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)			2.50%
Line of Credit | Coty Credit Agreement | Alternative Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)			1.50%
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount										$ 1,500,000,000
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Swingline loans
Debt Instrument [Line Items]
Aggregate principal amount										80,000,000.0
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Coty Term Loan A Facility due October 2020 | Term Loan
Debt Instrument [Line Items]
Amount of term loan facility										$ 1,750,000,000
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Coty Term Loan A Facility due October 2020 | Euro | Term Loan
Debt Instrument [Line Items]
Additional commitments under facility | €									€ 140,000,000
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Coty Term Loan B Facility due October 2022 | Term Loan
Debt Instrument [Line Items]
Discount percentage (percent)										0.50%	0.50%
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Coty Term Loan B Facility due October 2022 | US Dollar | Term Loan
Debt Instrument [Line Items]
Amount of term loan facility										$ 500,000,000
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Coty Term Loan B Facility due October 2022 | Euro | Term Loan
Debt Instrument [Line Items]
Amount of term loan facility | €											€ 665,000,000.0
Additional commitments under facility | €									€ 325,000,000
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Incremental Term A Facility | Term Loan
Debt Instrument [Line Items]
Additional commitments under facility	$ 975,000,000.0
Term of revolving credit facility (in years)	5 years
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Incremental Term Loan B Facility | Term Loan
Debt Instrument [Line Items]
Additional commitments under facility	$ 100,000,000.0
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Incremental Term Loan B Facility | LIBOR | Term Loan
Debt Instrument [Line Items]
Variable rate, minimum (percent)	0.00%
Debt issuance costs, net	$ 13,000,000
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Refinancing Term B USD Facility | US Dollar | Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.50%
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Refinancing Term B USD Facility | US Dollar | LIBOR | Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.50%
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Refinancing Term B USD Facility | US Dollar | Federal Funds Effective Swap Rate | Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.50%
Line of Credit | JPMorgan Chase NA, as Administrative Agent | Refinancing Term B USD Facility | US Dollar | London Interbank Offered Rate (LIBOR), One-Month | Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.00%