Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Lines of Credit - Debt Prior to Refinancing (Details)

v3.5.0.2
Long-Term Debt and Lines of Credit - Debt Prior to Refinancing (Details) - USD ($)
Dec. 03, 2014
Dec. 02, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2010
Debt Instrument [Line Items]            
Interest rate term loans     $ 197,219,000 $ 205,481,000    
Outstanding balance     5,000,000 0    
Capitalized amount of debt financing costs $ 2,834,000          
Deferred financing costs     2,000,000      
Variable Interest Rate Term Loans            
Debt Instrument [Line Items]            
Interest rate term loans 57,500,000 $ 33,500,000 $ 52,469,000 $ 55,344,000    
Quarterly principal payments   500,000        
Variable interest rate     2.25% 1.80% 2.40%  
Terminated RLOC            
Debt Instrument [Line Items]            
Revolving line of credit   60,000,000        
Outstanding balance         $ 0  
Deferred financing costs     $ 339,000      
Rabo Agrifinance Inc            
Debt Instrument [Line Items]            
Capitalized amount of debt financing costs           $ 1,202,000
Deferred financing costs 318,000 $ 697,000        
Write off of deferred financing cost $ 379,000          
One Month LIBOR | Variable Interest Rate Term Loans            
Debt Instrument [Line Items]            
LIBOR spread   2.25%        
One Month LIBOR | Terminated RLOC            
Debt Instrument [Line Items]            
LIBOR spread 1.95%          
LIBOR | Terminated RLOC            
Debt Instrument [Line Items]            
Annual commitment fee (as a percent)   0.20%        
Minimum | One Month LIBOR | Terminated RLOC            
Debt Instrument [Line Items]            
LIBOR spread   1.95%        
Maximum | One Month LIBOR | Terminated RLOC            
Debt Instrument [Line Items]            
LIBOR spread   2.95%