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Segment Information - Schedule of Information by Business Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,631 | $ 26,517 | $ 35,600 | $ 17,533 | $ 4,666 | $ 51,518 | $ 56,200 | $ 17,445 | $ 81,281 | $ 129,829 | $ 144,196
Total operating expenses | (3,633) | 14,603 | 27,767 | 16,951 | 28,013 | 36,510 | 41,684 | 14,692 | 55,688 | 120,899 | 109,137
Total gross profit (loss) | 5,264 | $ 11,914 | $ 7,833 | $ 582 | (23,347) | $ 15,008 | $ 14,516 | $ 2,753 | 25,593 | 8,930 | 35,059
Total capital expenditures |  |  |  |  |  |  |  |  | 16,352 | 13,353 | 14,305
Total depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 13,756 | 15,226 | 15,382
Total Assets | 423,422 |  |  |  | 419,182 |  |  |  | 423,422 | 419,182 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 81,281 | 129,829 | 144,196
Total operating expenses |  |  |  |  |  |  |  |  | 55,688 | 120,899 | 109,137
Total gross profit (loss) |  |  |  |  |  |  |  |  | 25,593 | 8,930 | 35,059
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 80 | 969 | 1,619
Total depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 70 | 520 | 468
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 1,766 |  |  |  | 6,391 |  |  |  | 1,766 | 6,391 |
Alico Citrus |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 78,121 | 123,441 | 137,282
Total operating expenses |  |  |  |  |  |  |  |  | 51,709 | 111,947 | 102,347
Alico Citrus | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total gross profit (loss) |  |  |  |  |  |  |  |  | 26,412 | 11,494 | 34,935
Total capital expenditures |  |  |  |  |  |  |  |  | 15,968 | 11,738 | 10,393
Total depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 13,467 | 14,054 | 13,982
Total Assets | 405,752 |  |  |  | 387,972 |  |  |  | 405,752 | 387,972 |
Water Resources and Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 3,160 | 6,388 | 6,914
Total operating expenses |  |  |  |  |  |  |  |  | 3,979 | 8,952 | 6,790
Water Resources and Other Operations | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total gross profit (loss) |  |  |  |  |  |  |  |  | (819) | (2,564) | 124
Total capital expenditures |  |  |  |  |  |  |  |  | 304 | 646 | 2,293
Total depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 219 | 652 | $ 932
Total Assets | $ 15,904 |  |  |  | $ 24,819 |  |  |  | $ 15,904 | $ 24,819 |

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