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Related Party Transactions - Additional Information (Details) - Fit for Life, LLC - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Oct. 11, 2016	Sep. 30, 2017	Sep. 30, 2017
Related Party Transaction [Line Items]
Annual base rent for sublease			$ 0.3
Sublease contractual term			39 months
Recognized sublease income		$ 0.1	$ 0.2
Estimated future sublease income		$ 0.7	$ 0.7
Chief Executive Officer
Related Party Transaction [Line Items]
Percentage of outstanding common stock	10.00%

X

- Definition

Operating leases annual base rent of sublease.

+ References

No definition available.

+ Details

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Namespace Prefix:	elf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of outstanding common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	elf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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