Financial Information from Continuing Operations By Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Geographic Reporting Disclosure [Line Items]
Percentage Of Export Sales From Domestic To Total Net Sales	7.30%	7.90%	9.90%
Assets	$ 827,867	$ 777,328
Net sales	$ 616,899	589,510	$ 598,204
Largest customer sales in fiscal year, percent	3.00%
Property, plant & equipment, net	$ 53,275	40,285
United States
Geographic Reporting Disclosure [Line Items]
Net sales	229,026	220,689	231,093
Property, plant & equipment, net	26,075	18,150
GERMANY
Geographic Reporting Disclosure [Line Items]
Net sales	29,532	34,700	29,926
UNITED KINGDOM
Geographic Reporting Disclosure [Line Items]
Net sales	36,933	36,290	34,085
Property, plant & equipment, net	8,749	7,599
SAUDI ARABIA
Geographic Reporting Disclosure [Line Items]
Net sales	26,699	23,113	25,762
AUSTRALIA
Geographic Reporting Disclosure [Line Items]
Net sales	23,382	22,165	28,607
BRAZIL
Geographic Reporting Disclosure [Line Items]
Net sales	25,170	22,769	20,523
Property, plant & equipment, net	2,971	2,870
CANADA
Geographic Reporting Disclosure [Line Items]
Net sales	25,010	19,248	29,643
China
Geographic Reporting Disclosure [Line Items]
Net sales	17,658	16,258	14,081
UNITED ARAB EMIRATES
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	3,285	3,130
NETHERLANDS
Geographic Reporting Disclosure [Line Items]
Net sales	17,525	15,737	11,044
Property, plant & equipment, net	2,924	2,547
SPAIN
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	5,042	1,560
All Other
Geographic Reporting Disclosure [Line Items]
Net sales	185,964	178,541	$ 173,440
Property, plant & equipment, net	4,229	4,429
General Corporate
Geographic Reporting Disclosure [Line Items]
Assets	$ 130,450	$ 136,998