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Condensed Consolidated Statements of Earnings - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Income Statement [Abstract]        
Operating revenues $ 121,054 $ 169,571 $ 342,187 $ 424,436
Cost of operating revenues 91,055 118,093 259,066 305,245
Gross profit 29,999 51,478 83,121 119,191
Operating expenses:        
Selling expense 7,515 10,842 23,934 31,087
General and administrative expense 14,695 17,862 46,585 43,866
Engineering and research expense 3,314 3,960 10,547 11,932
Total operating expenses 25,524 32,664 81,066 86,885
Operating income 4,475 18,814 2,055 32,306
Other income (expense):        
Interest expense (1,169) (1,226) (3,552) (3,502)
Interest income 525 540 1,930 1,171
Other expense, net (602) (683) (591) (2,062)
Earnings (loss) before income taxes 3,229 17,445 (158) 27,913
Income tax expense (benefit) 332 7,066 (827) 12,614
Net earnings $ 2,897 $ 10,379 $ 669 $ 15,299
Earnings per share:        
Basic $ 0.27 $ 0.96 $ 0.06 $ 1.43
Diluted $ 0.27 $ 0.96 $ 0.06 $ 1.42
Shares used in computing earnings per share:        
Basic 10,786 10,757 10,779 10,735
Diluted 10,814 10,785 10,807 10,763
Cash dividends declared per share $ 0.31 $ 0.30 $ 0.93 $ 0.90