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Condensed Consolidated Statements Of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 120,573 $ 141,089 $ 242,195 $ 275,934
Cost of operating revenues 88,128 101,533 175,336 199,464
Gross profit 32,445 39,556 66,859 76,470
Operating expenses:        
Selling expense 10,363 10,231 20,355 19,648
General and administrative expense 23,028 11,680 32,043 24,551
Engineering and research expense 3,748 3,109 7,407 5,833
Total operating expenses 37,139 25,020 59,805 50,032
Operating income (loss) (4,694) 14,536 7,054 26,438
Other income (expense):        
Interest expense (1,201) (209) (2,397) (280)
Interest income 229 162 393 334
Other expense, net (527) (351) (847) (693)
Earnings (loss) before income taxes (6,193) 14,138 4,203 25,799
Income tax expense (benefit) (2,064) 5,143 1,388 9,236
Net earnings (loss) $ (4,129) $ 8,995 $ 2,815 $ 16,563
Earnings (loss) per share:        
Basic $ (0.37) $ 0.75 $ 0.25 $ 1.37
Diluted $ (0.37) $ 0.75 $ 0.25 $ 1.36
Shares used in computing earnings per share:        
Basic 11,024 11,982 11,142 12,103
Diluted 11,024 12,008 11,163 12,141
Cash dividends declared per share $ 0.280 $ 0.270 $ 0.560 $ 0.540