Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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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- Definition

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.

+ References

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)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The pro forma diluted 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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BUSINESS COMBINATIONS - Pro Forma Schedule (Details) - Galleria - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Oct. 01, 2016	Jun. 30, 2018	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)			(101.2)	171.2
Pro forma Net income attributable to Coty Inc.			$ (142.7)	$ 135.5
Pro forma Net income attributable to Coty Inc. per common share:
Basic (in dollars per share)			$ (0.19)	$ 0.18
Diluted (in dollars per share)			$ (0.19)	$ 0.18
Acquisition-related costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma Net income (loss)		$ (476.3)	$ (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