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Condensed Consolidated Statements Of Earnings - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Income Statement [Abstract]        
Operating revenues $ 130,339 $ 124,125 $ 254,865 $ 234,515
Cost of operating revenues 95,023 91,184 187,152 173,200
Gross profit 35,316 32,941 67,713 61,315
Operating expenses:        
Selling expense 10,020 10,132 20,245 20,114
General and administrative expense 14,311 10,230 26,229 21,585
Engineering and research expense 3,919 4,057 7,972 8,359
Total operating expenses 28,250 24,419 54,446 50,058
Operating income 7,066 8,522 13,267 11,257
Other income (expense):        
Interest expense (1,095) (1,201) (2,331) (2,410)
Interest income 311 171 686 336
Other (expense) income, net (606) 144 (1,154) (212)
Earnings before income taxes 5,676 7,636 10,468 8,971
Income tax expense 3,941 2,624 5,548 3,086
Net earnings $ 1,735 $ 5,012 $ 4,920 $ 5,885
Earnings per share:        
Basic $ 0.16 $ 0.47 $ 0.46 $ 0.55
Diluted $ 0.16 $ 0.47 $ 0.46 $ 0.55
Shares used in computing earnings per share:        
Basic 10,743 10,657 10,724 10,647
Diluted 10,765 10,674 10,752 10,670
Cash dividends declared per share $ 0.30 $ 0.29 $ 0.60 $ 0.58