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Restatement of Previously Issued Consolidated Financial Statements - 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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

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