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Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2020
Nov. 02, 2020
Document And Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2020  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2020  
Entity File Number 001-32924  
Entity Registrant Name Green Plains Inc.  
Entity Central Index Key 0001309402  
Entity Incorporation, State or Country Code IA  
Entity Tax Identification Number 84-1652107  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   35,658,284
Entity Small Business false  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol GPRE  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Amendment Flag false  
Entity Address, Address Line One 1811 Aksarben Drive  
Entity Address, City or Town Omaha  
Entity Address, State or Province NE  
Entity Address, Postal Zip Code 68106  
City Area Code 402  
Local Phone Number 884-8700  
Entity Shell Company false