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Inventories - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Inventory Disclosure [Abstract] |  |  |  |  |
Lower of cost or market adjustment | $ 10.1 | $ 1.7 | $ 10.1 | $ 1.7 | $ 2.6

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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: | duration

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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