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v3.19.2

Subsequent Events (Details) - Subsequent Event | Jul. 03, 2019 engine
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Subsequent Event [Line Items] |
Sale leaseback transaction, number of engines | 27
Number of engines purchased | 5

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Assets Purchased + References No definition available. + Details
Name: | wlfc_NumberOfAssetsPurchased
Namespace Prefix: | wlfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Sale Leaseback Transaction, Number Of Assets + References No definition available. + Details
Name: | wlfc_SaleLeasebackTransactionNumberOfAssets
Namespace Prefix: | wlfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |