BUSINESS COMBINATIONS - Pro Forma Schedule (Details) - Galleria - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
Oct. 01, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma Net revenues		$ 8,889.2	$ 8,219.6
Pro forma Net income (loss)		(111.9)	159.1
Pro forma Net income attributable to Coty Inc.		$ (148.0)	$ 125.2
Pro forma Net income attributable to Coty Inc. per common share:
Basic (in dollars per share)		$ (0.20)	$ 0.17
Diluted (in dollars per share)		$ (0.20)	$ 0.16
Acquisition-related costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma Net income (loss)		$ (465.4)	$ (45.8)
Amortization of inventory step up
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma Net income (loss)		$ (89.6)	$ (80.1)
Majority Shareholders \| Pre-Merger Holders of Galleria Common Stock
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of shares received by former holders of Galleria common stock (in shares)	409.7

Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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Business Acquisition, Pro Forma Net Income (Loss) Attributable to Parent

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Number of shares of equity interests issued or issuable to acquire entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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