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Summary of Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | $ 4,740 |  |  |  | $ 3,137 |  |  |  | $ 4,740 | $ 3,137 |
Operating revenue | 4,850 | $ 46,853 | $ 71,889 | $ 20,604 | 2,374 | $ 71,670 | $ 60,012 | $ 19,070 | 144,196 | 153,126 | $ 104,003
Customer Concentration Risk | USSC |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Operating revenue |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 19,633
% of Total Revenue |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 18.90%
Customer Concentration Risk | Florida Orange Marketers, Inc. |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Operating revenue |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 23,826
% of Total Revenue |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 22.90%
Customer Concentration Risk | Citrosuco North America, Inc. |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Operating revenue |  |  |  |  |  |  |  |  | $ 1,296 | $ 3,870 | $ 804
% of Total Revenue |  |  |  |  |  |  |  |  | 0.90% | 2.50% | 0.80%
Customer Concentration Risk | Louis Dreyfus |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Operating revenue |  |  |  |  |  |  |  |  | $ 0 | $ 22,460 | $ 24,135
% of Total Revenue |  |  |  |  |  |  |  |  | 0.00% | 14.70% | 23.20%
Customer Concentration Risk | Cutrale Citrus Juice |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Operating revenue |  |  |  |  |  |  |  |  | $ 22,735 | $ 23,556 | $ 3,984
% of Total Revenue |  |  |  |  |  |  |  |  | 15.80% | 15.40% | 3.80%
Customer Concentration Risk | Minute Maid |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Operating revenue |  |  |  |  |  |  |  |  | $ 49,271 | $ 57,484 | $ 0
% of Total Revenue |  |  |  |  |  |  |  |  | 34.20% | 37.50% | 0.00%
Customer Concentration Risk | Tropicana |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable | $ 1,710 |  |  |  | $ 1,019 |  |  |  | $ 1,710 | $ 1,019 |
Operating revenue |  |  |  |  |  |  |  |  | $ 46,898 | $ 21,925 | $ 16,433
% of Total Revenue |  |  |  |  |  |  |  |  | 32.50% | 14.30% | 15.80%

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