Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2024	Nov. 30, 2023
Income Statement [Abstract]
Operating revenues	$ 166,281	$ 161,358
Cost of operating revenues	116,315	111,453
Gross profit	49,966	49,905
Operating expenses:
Selling expense	10,211	9,817
General and administrative expense	15,008	14,662
Engineering and research expense	3,864	4,352
Total operating expenses	29,083	28,831
Operating income	20,883	21,074
Other income (expense):
Interest expense	(752)	(877)
Interest income	1,245	1,068
Other income (expense), net	658	(270)
Total other income (expense)	1,151	(79)
Earnings before income taxes	22,034	20,995
Income tax expense	4,870	5,976
Net earnings	$ 17,164	$ 15,019
Earnings per share:
Basic	$ 1.58	$ 1.36
Diluted	$ 1.57	$ 1.36
Shares used in computing earnings per share:
Basic	10,853	11,017
Diluted	10,903	11,059
Cash dividends declared per share	$ 0.36	$ 0.35