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10. Commitments and Contingencies (Details) - Solar Module Collection and Recycling Liability - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Accrued solar module collection and recycling liability | $ 137,770 | $ 134,394

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- Definition Solar Module Collection And Recycling Liability + References No definition available. + Details
Name: | fslr_SolarModuleCollectionAndRecyclingLiability
Namespace Prefix: | fslr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration