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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2017 | Feb. 29, 2016 | Aug. 31, 2016
Impaired Assets [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 118,122 |
Goodwill | $ 509,078 |  | $ 509,078 |  | $ 519,276
Asset Impairment Charges | 0 | $ 186,511 | 0 | 186,511 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  | 16,653 |
Impairment of Intangible Assets, Finite-lived |  |  |  | 27,952 |
Tangible Asset Impairment Charges |  |  |  | 23,784 |
Future Amortization Expense, Remainder of 2017 | 10,000 |  | 10,000 |  |
Future Amortization Expense, 2018 | 19,900 |  | 19,900 |  |
Future Amortization Expense, 2019 | 19,300 |  | 19,300 |  |
Future Amortization Expense, 2020 | 18,700 |  | 18,700 |  |
Future Amortization Expense, 2021 | 17,800 |  | 17,800 |  |
Future Amortization Expense, 2022 | 15,800 |  | 15,800 |  |
Future Amortization Expense, Thereafter | 34,400 |  | 34,400 |  |
Energy |  |  |  |  |
Impaired Assets [Line Items] |  |  |  |  |
Goodwill | 184,694 |  | 184,694 |  | 187,321
Asset Impairment Charges |  | 140,900 |  | 140,900 |
Engineered Solutions |  |  |  |  |
Impaired Assets [Line Items] |  |  |  |  |
Goodwill | $ 224,516 |  | $ 224,516 |  | $ 230,216
Asset Impairment Charges |  | $ 45,700 |  | 45,700 |
Cortland [Domain] |  |  |  |  |
Impaired Assets [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 34,502 |
Asset Impairment Charges |  |  |  | 36,713 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  | 2,211 |
Impairment of Intangible Assets, Finite-lived |  |  |  | 0 |
Tangible Asset Impairment Charges |  |  |  | 0 |
Viking [Domain] |  |  |  |  |
Impaired Assets [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 39,099 |
Asset Impairment Charges |  |  |  | 104,124 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  | 13,289 |
Impairment of Intangible Assets, Finite-lived |  |  |  | 27,952 |
Tangible Asset Impairment Charges |  |  |  | 23,784 |
maximatecc [Domain] |  |  |  |  |
Impaired Assets [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | 44,521 |
Asset Impairment Charges |  |  |  | 45,674 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  | 1,153 |
Impairment of Intangible Assets, Finite-lived |  |  |  | 0 |
Tangible Asset Impairment Charges |  |  |  | $ 0 |

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