Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2017	Feb. 01, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	COTY INC.
Document Type	10-Q
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding		749,864,475
Amendment Flag	false
Entity Central Index Key	0001024305
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2