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v3.25.1

Inventories - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
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Inventory Disclosure [Abstract] |  |  |
Lower of cost or market adjustment | $ 2.5 | $ 2.1 | $ 4.2

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- Definition Lower Of Cost Or Market Adjustment. + References No definition available. + Details
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Namespace Prefix: | gpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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