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Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 138,464,000 |  |  |  | $ 138,454,000 |  |  |  |  |  |  |  | $ 138,464,000 | $ 138,454,000 | $ 144,284,000
Other (income) loss | $ (27,015,000) | $ (14,622,000) | $ (11,364,000) | $ (25,014,000) | (25,407,000) | $ (11,952,000) | $ (18,083,000) | $ (44,509,000) | $ (36,378,000) | $ (62,592,000) | $ (51,000,000) | $ (74,544,000) | $ (78,015,000) | (99,951,000) | (47,609,000)
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,130,000)
Other (income) loss |  | 0 | 0 | 0 | $ (743,000) | (5,000) | (848,000) | (7,509,000) | 0 | (8,357,000) | 0 | (8,361,000) |  | (9,105,000) | 0
Reclassification | Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Gain) loss on investments |  |  | (4,100,000) | (2,800,000) |  |  | (2,900,000) | 7,400,000 |  |  |  |  |  | (4,600,000) | (9,300,000)
Other (income) loss |  |  | (4,100) | (2,800) |  |  | (2,900) | (7,400) |  |  |  |  |  | $ (4,600,000) | $ (9,300,000)
Freight Derivatives and Related Misstatements | Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ (16,000,000) | $ (16,000,000) | $ (16,000,000) |  | $ 16,000,000 | $ (16,000,000) | $ (16,000,000) | $ (16,000,000) | $ (16,000,000) | $ (16,000,000) | $ 16,000,000 |  |  |

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