Condensed Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2021	Nov. 30, 2020
Income Statement [Abstract]
Operating revenues	$ 166,152	$ 108,485
Cost of operating revenues	128,714	77,077
Gross profit	37,438	31,408
Operating expenses:
Selling expense	7,990	7,331
General and administrative expense	12,880	13,452
Engineering and research expense	3,207	3,090
Total operating expenses	24,077	23,873
Operating income	13,361	7,535
Other (expense) income:
Interest expense	(1,163)	(1,201)
Interest income	177	303
Other expense, net	(2,900)	246
Total other (expense) income	(3,886)	(652)
Earnings before income taxes	9,475	6,883
Income tax expense (benefit)	1,574	(212)
Net earnings	$ 7,901	$ 7,095
Earnings per share:
Basic	$ 0.72	$ 0.65
Diluted	$ 0.72	$ 0.65
Shares used in computing earnings per share:
Basic	10,927	10,845
Diluted	11,026	10,888
Cash dividends declared per share	$ 0.33	$ 0.32