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Condensed Consolidated Statements of Earnings - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
Income Statement [Abstract]        
Operating revenues $ 166,241 $ 200,137 $ 342,400 $ 366,288
Cost of operating revenues 111,983 157,193 235,122 285,907
Gross profit 54,258 42,944 107,278 80,381
Operating expenses:        
Selling expense 8,733 7,932 18,410 15,922
General and administrative expense 13,739 13,022 28,176 25,901
Engineering and research expense 4,521 3,652 8,829 6,859
Total operating expenses 26,993 24,606 55,415 48,682
Operating income 27,265 18,338 51,863 31,699
Other income (expense):        
Interest expense (1,038) (1,176) (1,947) (2,339)
Interest income 490 160 865 338
Other income (expense), net (984) 1,882 (1,043) (1,018)
Total other income (expense) (1,532) 866 (2,125) (3,019)
Earnings before income taxes 25,733 19,204 49,738 28,680
Income tax expense 7,681 4,638 13,469 6,213
Net earnings $ 18,052 $ 14,566 $ 36,269 $ 22,467
Earnings per share:        
Basic $ 1.64 $ 1.33 $ 3.30 $ 2.05
Diluted $ 1.63 $ 1.32 $ 3.28 $ 2.04
Shares used in computing earnings per share:        
Basic 11,007 10,974 10,998 10,950
Diluted 11,063 11,014 11,068 11,020
Cash dividends declared per share $ 0.34 $ 0.33 $ 0.68 $ 0.66