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Condensed Consolidated Statements of Earnings - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Income Statement [Abstract]        
Operating revenues $ 161,936 $ 123,106 $ 413,998 $ 346,287
Cost of operating revenues 117,880 83,410 297,360 239,111
Gross profit 44,056 39,696 116,638 107,176
Operating expenses:        
Selling expense 7,570 7,417 22,680 22,101
General and administrative expense 12,043 13,055 39,770 38,026
Engineering and research expense 3,102 3,396 9,504 10,303
Total operating expenses 22,715 23,868 71,954 70,430
Operating income 21,341 15,828 44,684 36,746
Other (expense) income:        
Interest expense (1,178) (1,197) (3,584) (3,574)
Interest income 227 408 798 1,412
Other expense, net 764 (2,774) 699 (4,197)
Total other (expense) income (187) (3,563) (2,087) (6,359)
Earnings before income taxes 21,154 12,265 42,597 30,387
Income tax expense 3,357 2,171 5,829 6,432
Net earnings $ 17,797 $ 10,094 $ 36,768 $ 23,955
Earnings per share:        
Basic $ 1.63 $ 0.93 $ 3.38 $ 2.21
Diluted $ 1.61 $ 0.93 $ 3.35 $ 2.21
Shares used in computing earnings per share:        
Basic 10,907 10,835 10,879 10,818
Diluted 11,033 10,877 10,967 10,854
Cash dividends declared per share $ 0.33 $ 0.32 $ 0.97 $ 0.94