Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2023	Nov. 30, 2022
Income Statement [Abstract]
Operating revenues	$ 161,358	$ 176,159
Cost of operating revenues	111,453	123,139
Gross profit	49,905	53,020
Operating expenses:
Selling expense	9,817	9,677
General and administrative expense	14,662	14,437
Engineering and research expense	4,352	4,308
Total operating expenses	28,831	28,422
Operating income	21,074	24,598
Other income (expense):
Interest expense	(877)	(909)
Interest income	1,068	373
Other income (expense), net	(270)	(57)
Total other income (expense)	(79)	(593)
Earnings before income taxes	20,995	24,005
Income tax expense	5,976	5,788
Net earnings	$ 15,019	$ 18,217
Earnings per share:
Basic	$ 1.36	$ 1.66
Diluted	$ 1.36	$ 1.65
Shares used in computing earnings per share:
Basic	11,017	10,989
Diluted	11,059	11,073
Cash dividends declared per share	$ 0.35	$ 0.34