| Income Tax Effective Tax Rate [Table Text Block] |
| | | | | | | | | | | | | | | | | | Three Months Ended May 31, | | Nine Months Ended May 31, | | 2016 | | 2015 | | 2016 | | 2015 | Earnings (loss) before income taxes | $ | 20,339 |
| | $ | 34,971 |
| | $ | (141,242 | ) | | $ | 4,579 |
| Income tax (benefit) expense | (827 | ) | | (2,987 | ) | | (18,666 | ) | | 6,785 |
| Effective income tax rate | (4.1 | )% | | (8.5 | )% | | 13.2 | % | | 148.2 | % |
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