Debt Instrument, Variable Rate Floor

No definition available.

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

- Definition

Line Of Credit Covenant For Mandatory Payment Net Proceeds From Asset Disposition.

+ References

No definition available.

+ Details

Name:	elf_LineOfCreditCovenantForMandatoryPaymentNetProceedsFromAssetDisposition
Namespace Prefix:	elf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payments of both interest and principal.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash outflow to owners or shareholders, excluding ordinary dividends. Includes special dividends.

+ References

+ Details

Name:	us-gaap_PaymentsOfCapitalDistribution
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=elf_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=elf_SeniorSecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=elf_SecondLienTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=elf_NewSeniorSecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=elf_SwingLineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Details) - USD ($)				3 Months Ended		12 Months Ended
Debt - Additional Information (Details) - USD ($)	Sep. 27, 2017	Dec. 23, 2016	Jun. 07, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2017	Aug. 25, 2017	Jan. 31, 2014
Debt Instrument [Line Items]
Payment of special dividend			$ 72,000,000
Repayment of senior secured credit facility				$ 0	$ 2,000,000	$ 0	$ 2,000,000	$ 25,900,000
Term loan
Debt Instrument [Line Items]
Net proceeds in excess of term loan						2,500,000
Term loan \| Fiscal Quarters Ending September 30, 2019 through June 30, 2020
Debt Instrument [Line Items]
Line of credit facility, periodic payment						2,475,000
Term loan \| Fiscal Quarters Ending September 30, 2020 through June 30, 2021
Debt Instrument [Line Items]
Line of credit facility, periodic payment						3,093,750
Term loan \| Fiscal Quarters Ending September 30, 2021 through June 30, 2022
Debt Instrument [Line Items]
Line of credit facility, periodic payment						$ 4,125,000
2014 Senior Secured Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Amounts available under senior secured credit facility			25,000,000							$ 20,000,000
2014 Senior Secured Credit Facility \| Term loan
Debt Instrument [Line Items]
Amounts available under senior secured credit facility										105,000,000
Borrowings outstanding under senior secured credit facility			$ 64,000,000
2014 Senior Secured Credit Facility \| Second lien term loan
Debt Instrument [Line Items]
Amounts available under senior secured credit facility										$ 40,000,000
Repayment of senior secured credit facility	$ 40,000,000
Senior Secured Credit Facility
Debt Instrument [Line Items]
Amounts available under senior secured credit facility		$ 200,000,000							$ 215,000,000.0
Facility term		5 years
Senior Secured Credit Facility \| LIBOR
Debt Instrument [Line Items]
Variable rate floor						0.00%
Senior Secured Credit Facility \| Minimum \| LIBOR
Debt Instrument [Line Items]
Basis spread on interest rate		1.50%				1.50%
Senior Secured Credit Facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Basis spread on interest rate		0.50%				0.50%
Senior Secured Credit Facility \| Maximum \| LIBOR
Debt Instrument [Line Items]
Basis spread on interest rate		2.75%				3.25%
Senior Secured Credit Facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Basis spread on interest rate		1.75%				2.25%
Senior Secured Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Amounts available under senior secured credit facility						$ 50,000,000			50,000,000.0
Revolving credit facility, unused amount						$ 49,800,000
Senior Secured Credit Facility \| Revolving credit facility \| Minimum
Debt Instrument [Line Items]
Revolving credit facility, commitment fee						0.25%
Senior Secured Credit Facility \| Revolving credit facility \| Maximum
Debt Instrument [Line Items]
Revolving credit facility, commitment fee						0.35%
Senior Secured Credit Facility \| Term loan
Debt Instrument [Line Items]
Amounts available under senior secured credit facility									$ 165,000,000.0
Credit facility, interest rate						3.20%
Senior Secured Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Amounts available under senior secured credit facility						$ 7,000,000
Senior Secured Credit Facility \| Swing Line Loan
Debt Instrument [Line Items]
Amounts available under senior secured credit facility						$ 5,000,000