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Summary of Financial Information by Reportable Segment and Product Line (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Nov. 30, 2017 USD ($) Segment | Nov. 30, 2016 USD ($) | Aug. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 3 |  |
Net sales | $ 288,955 | $ 265,793 |
Operating profit (Loss) | 14,673 | 8,471 |
Assets | 1,490,241 |  | $ 1,516,955
Industrial Tools [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 84,510 | 79,039 |
Industrial |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 96,916 | 87,290 |
Operating profit (Loss) | 18,243 | 18,776 |
Assets | 314,215 |  | 329,134
Heavy Lifting Technology [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 12,406 | 8,251 |
Energy |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 75,841 | 84,646 |
Operating profit (Loss) | 293 | 3,210 |
Assets | 480,402 |  | 482,963
Energy Maintenance & Integrity |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 56,710 | 64,821 |
Other Energy Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 19,131 | 19,825 |
Engineered Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 116,198 | 93,857 |
Operating profit (Loss) | 6,334 | 755 |
Assets | 539,978 |  | 531,068
On-Highway |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 64,882 | 51,630 |
Agriculture, Off-Highway and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 51,316 | 42,227 |
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating profit (Loss) | (10,197) | $ (14,270) |
Assets | $ 155,646 |  | $ 173,790

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