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Condensed Consolidated Statements Of Earnings - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Condensed Consolidated Statements Of Earnings [Abstract]        
Operating revenues $ 151,533 $ 141,319 $ 386,048 $ 383,514
Cost of operating revenues 105,627 99,511 278,827 274,847
Gross profit 45,906 41,808 107,221 108,667
Operating expenses:        
Selling expense 10,451 10,606 30,565 30,961
General and administrative expense 13,693 11,882 35,278 43,925
Engineering and research expense 4,348 3,995 12,707 11,402
Total operating expenses 28,492 26,483 78,550 86,288
Operating income 17,414 15,325 28,671 22,379
Other income (expense):        
Interest expense (1,156) (1,179) (3,566) (3,576)
Interest income 545 127 881 520
Other expense, net (606) (208) (818) (1,055)
Earnings before income taxes 16,197 14,065 25,168 18,268
Income tax expense 5,245 4,421 8,331 5,809
Net earnings $ 10,952 $ 9,644 $ 16,837 $ 12,459
Earnings per share:        
Basic $ 1.03 $ 0.90 $ 1.58 $ 1.13
Diluted $ 1.02 $ 0.90 $ 1.58 $ 1.13
Shares used in computing earnings per share:        
Basic 10,677 10,709 10,657 10,997
Diluted 10,705 10,732 10,682 11,019
Cash dividends declared per share $ 0.29 $ 0.28 $ 0.87 $ 0.84