v3.5.0.2
Document And Entity Information - shares
9 Months Ended
Sep. 30, 2016
Oct. 31, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2016  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2016  
Entity Registrant Name Green Plains Inc.  
Entity Central Index Key 0001309402  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   38,368,478
Trading Symbol gpre