Financial Information from Continuing Operations By Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2022
Geographic Reporting Disclosure [Line Items]
Percentage Of Export Sales From Domestic To Total Net Sales	7.90%	9.90%	9.80%
Assets	$ 777,328	$ 762,597
Net sales	$ 589,510	$ 598,204	$ 571,223
Largest customer sales in fiscal year, percent	3.00%	3.00%	3.00%
Property, plant & equipment, net	$ 40,285	$ 38,968
United States
Geographic Reporting Disclosure [Line Items]
Net sales	220,689	231,093	$ 226,020
Property, plant & equipment, net	18,150	15,081
GERMANY
Geographic Reporting Disclosure [Line Items]
Net sales	34,700	29,926	28,004
UNITED KINGDOM
Geographic Reporting Disclosure [Line Items]
Net sales	36,290	34,085	29,316
Property, plant & equipment, net	7,599	7,543
SAUDI ARABIA
Geographic Reporting Disclosure [Line Items]
Net sales	23,113	25,762	20,892
AUSTRALIA
Geographic Reporting Disclosure [Line Items]
Net sales	22,165	28,607	26,667
BRAZIL
Geographic Reporting Disclosure [Line Items]
Net sales	22,769	20,523	16,517
Property, plant & equipment, net	2,870	3,197
CANADA
Geographic Reporting Disclosure [Line Items]
Net sales	19,248	29,643	19,651
China
Geographic Reporting Disclosure [Line Items]
Net sales	16,258	14,081	15,434
UNITED ARAB EMIRATES
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	3,130	4,004
NETHERLANDS
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	2,547	2,423
SPAIN
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	1,560	1,484
All Other
Geographic Reporting Disclosure [Line Items]
Net sales	178,145	169,877	173,868
Property, plant & equipment, net	4,429	5,235
FRANCE
Geographic Reporting Disclosure [Line Items]
Net sales	16,133	14,606	$ 14,854
General Corporate
Geographic Reporting Disclosure [Line Items]
Assets	$ 136,998	$ 102,357