Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2018	Aug. 14, 2018	Dec. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	COTY INC.
Document Type	10-K
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding		750,792,022
Amendment Flag	false
Entity Central Index Key	0001024305
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Public Float			$ 8,993,216,977