Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2022	Nov. 30, 2021
Income Statement [Abstract]
Operating revenues	$ 176,159	$ 166,152
Cost of operating revenues	123,139	128,714
Gross profit	53,020	37,438
Operating expenses:
Selling expense	9,677	7,990
General and administrative expense	14,437	12,880
Engineering and research expense	4,308	3,207
Total operating expenses	28,422	24,077
Operating income	24,598	13,361
Other income (expense):
Interest expense	(909)	(1,163)
Interest income	373	177
Other expense, net	(57)	(2,900)
Total other income (expense)	(593)	(3,886)
Earnings before income taxes	24,005	9,475
Income tax expense	5,788	1,574
Net earnings	$ 18,217	$ 7,901
Earnings per share:
Basic	$ 1.66	$ 0.72
Diluted	$ 1.65	$ 0.72
Shares used in computing earnings per share:
Basic	10,989	10,927
Diluted	11,073	11,026
Cash dividends declared per share	$ 0.34	$ 0.33