Annual report pursuant to Section 13 and 15(d)

Debt - Schedule of Long-term Debt, Net of Current Portion (Details)

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Debt - Schedule of Long-term Debt, Net of Current Portion (Details) - USD ($)
 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Dec. 03, 2014
Dec. 02, 2014
Sep. 30, 2014
Debt Instrument [Line Items]          
Long-term debt, net of current portion $ 205,881,000       $ 61,640,000
Less current portion 4,511,000       3,196,000
Long-term debt 201,370,000       58,444,000
Metropolitan Life Insurance Company and New England Life Insurance Company fixed rate term loans in the original principal amount of $125,000,000: the loans bear interest at the rate of 4.15% per annum as of September 30,2015. The loans are collateralized by real estate and mature in November 2029.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion 111,563,000   $ 125,000,000   0
Principal amount $ 125,000,000        
Fixed interest rate 4.15%   4.15%    
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57,500,000: the variable interest rate was approximately 1.80% per annum as of September 30, 2015. The loans are collateralized by real estate and mature in November 2029.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion $ 55,344,000   $ 57,500,000 $ 33,500,000 $ 0
Principal amount $ 57,500,000        
Variable interest rate 1.80%       2.40%
Metropolitan Life Insurance Company term loan: the loan bears interest at the rate of 5.30% per annum as of September 30, 2015. A final advance of $2,500,000 is scheduled for March 1, 2016 subject to certain performance conditions. The interest rate is subject to adjustment on the date of the final advance. The loan is collateralized by real estate and matures in February 2029.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion $ 2,500,000       $ 0
Final advance $ 2,500,000        
Fixed interest rate 5.30%        
Rabo Agrifinance, Inc. variable rate term loan. The loan was refinanced on December 3, 2014.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion $ 0       34,000,000
Prudential Mortgage Capital Company, LLC fixed rate term loans: the loans bear interest at the rate of 5.35% per annum as of June 30, 2015. The loans are collateralized by real estate and mature in June 2033.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion 25,640,000       27,550,000
Fixed interest rate   5.35%      
Prudential Mortgage Capital Company, LLC fixed rate term loan: the loan bears interest at the rate of 3.85% per annum as of June 30, 2015. The loan is collateralized by real estate and matures in September 2021.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion 5,390,000       0
Fixed interest rate   3.85%      
Prudential Mortgage Capital Company, LLC fixed rate term loan: the loan bears interest at the rate of 3.45% per annum as of June 30, 2015. The loan is collateralized by real estate and matures in September 2039.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion 5,390,000       0
Fixed interest rate   3.45%      
Note payable to a financing company collateralized by equipment and maturing in December 2016.          
Debt Instrument [Line Items]          
Long-term debt, net of current portion $ 54,000       $ 90,000