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Financial Information from Continuing Operations By Geographic Region (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | $ 654,758 | $ 641,303 | $ 616,591
Assets | 1,124,274 | 1,485,217 |
Property, plant and equipment, net | 56,729 | 54,974 |
UNITED STATES |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 249,644 | 236,036 | 230,513
Property, plant and equipment, net | 21,047 | 17,040 |
UNITED KINGDOM |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 30,127 | 35,388 | 42,875
Property, plant and equipment, net | 2,983 | 3,663 |
KAZAKHSTAN |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 30,081 | 19,814 | 22,989
Property, plant and equipment, net | 2,635 | 3,056 |
GERMANY |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 26,445 | 30,643 | 27,611
AUSTRALIA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 25,749 | 30,796 | 36,076
SAUDI ARABIA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 21,625 | 20,749 | 22,089
BRAZIL |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 18,779 | 17,900 | 15,456
Property, plant and equipment, net | 2,851 | 2,923 |
CANADA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 18,686 | 20,172 | 17,458
CHINA |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 18,548 | 19,239 | 18,323
Property, plant and equipment, net | 12,179 | 13,442 |
UNITED ARAB EMIRATES |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Property, plant and equipment, net | 8,734 | 7,876 |
NETHERLANDS |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Property, plant and equipment, net | 2,720 | 3,530 |
All other |  |  |
Geographic Reporting Disclosure [Line Items] |  |  |
Net sales | 215,074 | 210,566 | $ 183,201
Property, plant and equipment, net | $ 3,580 | $ 3,444 |

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