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Summary of Financial Information by Reportable Segment and Product Line (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Nov. 30, 2012 | Nov. 30, 2011 | Aug. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 377,248 | $ 392,799 |
Operating profit (Loss) | 51,302 | 57,281 |
Assets | 2,025,456 |  | 2,007,119
Industrial |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 101,122 | 100,253 |
Operating profit (Loss) | 27,006 | 27,934 |
Assets | 271,607 |  | 268,735
Energy |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 90,769 | 80,421 |
Operating profit (Loss) | 15,387 | 13,217 |
Assets | 545,760 |  | 540,409
Electrical |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 69,439 | 82,833 |
Operating profit (Loss) | 7,828 | 4,977 |
Assets | 444,780 |  | 437,914
Engineered Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 115,918 | 129,292 |
Operating profit (Loss) | 7,625 | 18,999 |
Assets | 671,372 |  | 667,550
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating profit (Loss) | (6,544) | (7,846) |
Assets | 91,937 |  | 92,511
Vehicle Systems |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 61,187 | 76,363 |
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 54,731 | $ 52,929 |

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