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Financial Information from Continuing Operations By Geographic Region (Detail) - USD ($) | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Geographic Reporting Disclosure [Line Items] |  |  |
Assets | $ 1,442,538,000 | $ 1,636,917,000 |
Net sales | 1,149,410,000 | 1,249,254,000 | $ 1,399,862,000
Long-Lived Assets | 117,179,000 | 145,062,000 |
United States |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 477,670,000 | 526,061,000 | 573,590,000
Long-Lived Assets | 32,205,000 | 41,645,000 |
Netherlands |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 143,517,000 | 139,432,000 | 151,549,000
Australia |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 62,779,000 | 94,319,000 | 82,778,000
Long-Lived Assets | 15,399,000 | 15,227,000 |
UNITED KINGDOM |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 115,183,000 | 113,743,000 | 162,508,000
Long-Lived Assets | 9,914,000 | 21,704,000 |
China |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Long-Lived Assets | 16,863,000 | 18,199,000 |
United Arab Emirates |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 55,906,000 | 44,211,000 | 18,101,000
Long-Lived Assets | 8,399,000 | 1,104,000 |
All other |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 294,355,000 | 331,488,000 | 411,336,000
Long-Lived Assets | 34,399,000 | 47,183,000 |
Energy |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Assets | 479,169,000 | 601,521,000 |
Net sales | 392,731,000 | 411,875,000 | 462,368,000
Industrial |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Assets | 308,222,000 | 293,738,000 |
Net sales | 359,817,000 | 402,464,000 | 413,901,000
Engineered Solutions |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Assets | 493,840,000 | 588,200,000 |
Net sales | 396,862,000 | 434,915,000 | $ 523,592,000
General Corporate |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Assets | $ 161,307,000 | $ 153,458,000 |

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