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Financial Information from Continuing Operations By Geographic Region (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Geographic Reporting Disclosure [Line Items] |  |  |
Percentage Of Export Sales From Domestic To Total Net Sales | 7.20% | 7.30% | 7.40%
Assets | $ 820,247 | $ 824,294 |
Net sales | $ 528,660 | $ 493,292 | $ 654,758
Largest customer sales in fiscal year, percent | 3.00% | 3.00% | 3.00%
Property, plant & equipment, net | $ 48,590 | $ 61,405 |
United States |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 188,070 | 185,279 | $ 249,644
Property, plant & equipment, net | 18,942 | 21,410 |
GERMANY |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 28,456 | 24,401 | 26,445
UNITED KINGDOM |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 39,896 | 24,033 | 30,127
Property, plant & equipment, net | 11,818 | 9,654 |
SAUDI ARABIA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 16,715 | 19,787 | 21,625
AUSTRALIA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 24,990 | 19,332 | 25,749
Property, plant & equipment, net | 751 | 1,014 |
BRAZIL |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 13,937 | 16,413 | 18,779
Property, plant & equipment, net | 2,248 | 1,784 |
CANADA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 17,348 | 15,924 | 18,686
China |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 16,927 | 15,058 | 18,548
Property, plant & equipment, net | 750 | 12,248 |
UNITED ARAB EMIRATES |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Property, plant & equipment, net | 6,448 | 7,525 |
NETHERLANDS |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Property, plant & equipment, net | 2,625 | 2,546 |
KAZAKHSTAN |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Property, plant & equipment, net | 1,552 | 2,052 |
SPAIN |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Property, plant & equipment, net | 1,506 | 1,705 |
All Other |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 182,321 | 173,065 | $ 245,155
Property, plant & equipment, net | 1,950 | 1,467 |
General Corporate |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Assets | $ 126,246 | $ 171,103 |

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