Fixed interest rate related to the interest rate derivative.

No definition available.

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

+ Details

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=wex_InterestRateSwapMaturityDecember2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=wex_InterestRateSwapMaturityMay2024InstrumentOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=wex_InterestRateSwapMaturityMay2024InstrumentTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=wex_InterestRateSwapMaturityMay2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=wex_InterestRateSwapMaturityMay2026InstrumentOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=wex_InterestRateSwapMaturityMay2026InstrumentTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative Instruments - Schedule of Interest Rate Swaps (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions	Jun. 30, 2023	Apr. 26, 2023	Apr. 25, 2023
Derivative [Line Items]
Notional amount at inception	$ 1,100.0
Maturity December 2023
Derivative [Line Items]
Fixed interest rate		1.789%	1.862%
Notional amount at inception	200.0
Maturity May 2024, Instrument One
Derivative [Line Items]
Fixed interest rate		0.459%	0.435%
Notional amount at inception	$ 150.0
Maturity May 2024, Instrument One \| One-Month USD-SOFR CME Term Rate
Derivative [Line Items]
Derivative, variable interest rate	0.114%
Maturity May 2024, Instrument Two
Derivative [Line Items]
Fixed interest rate		0.367%	0.44%
Notional amount at inception	$ 150.0
Maturity May 2025
Derivative [Line Items]
Fixed interest rate		0.648%	0.678%
Notional amount at inception	300.0
Maturity May 2026, Instrument One
Derivative [Line Items]
Fixed interest rate		0.836%	0.909%
Notional amount at inception	150.0
Maturity May 2026, Instrument Two
Derivative [Line Items]
Fixed interest rate		0.883%	0.91%
Notional amount at inception	$ 150.0