Financial Information from Continuing Operations By Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2024
Geographic Reporting Disclosure [Line Items]
Percentage Of Export Sales From Domestic To Total Net Sales	4.40%	7.30%	7.90%
Assets	$ 858,600	$ 827,900
Net sales	$ 652,300	616,900	$ 589,500
Largest customer sales in fiscal year, percent	3.00%
Property, plant & equipment, net	$ 54,400	53,300
United States
Geographic Reporting Disclosure [Line Items]
Net sales	258,500	229,000	220,700
Property, plant & equipment, net	26,800	26,100
GERMANY
Geographic Reporting Disclosure [Line Items]
Net sales	33,600	29,500	34,700
UNITED KINGDOM
Geographic Reporting Disclosure [Line Items]
Net sales	27,700	36,900	36,300
Property, plant & equipment, net	7,400	8,700
SAUDI ARABIA
Geographic Reporting Disclosure [Line Items]
Net sales	23,000	26,700	23,100
AUSTRALIA
Geographic Reporting Disclosure [Line Items]
Net sales	25,200	23,400	22,200
BRAZIL
Geographic Reporting Disclosure [Line Items]
Net sales	27,100	25,200	22,800
Property, plant & equipment, net	3,100	3,000
CANADA
Geographic Reporting Disclosure [Line Items]
Net sales	25,600	25,000	19,200
China
Geographic Reporting Disclosure [Line Items]
Net sales	17,000	17,700	16,300
UNITED ARAB EMIRATES
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	3,100	3,300
NETHERLANDS
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	4,300	2,900
SPAIN
Geographic Reporting Disclosure [Line Items]
Property, plant & equipment, net	4,800	5,000
All Other
Geographic Reporting Disclosure [Line Items]
Net sales	195,300	188,100	178,100
Property, plant & equipment, net	4,900	4,300
FRANCE
Geographic Reporting Disclosure [Line Items]
Net sales	19,300	15,400	$ 16,100
General Corporate
Geographic Reporting Disclosure [Line Items]
Assets	$ 143,100	$ 130,500