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Consolidated Statements Of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Consolidated Statements Of Operations [Abstract]      
Operating revenues $ 560,181 $ 617,933 $ 690,848
Cost of operating revenues 403,860 446,938 496,014
Gross profit 156,321 170,995 194,834
Operating expenses:      
Selling expense 40,516 38,284 32,937
General and administrative expense 52,261 43,228 43,441
Engineering and research expense 12,849 11,125 11,395
Total operating expenses 105,626 92,637 87,773
Operating income 50,695 78,358 107,061
Interest expense (2,626) (187) (304)
Interest income 631 729 496
Other (expense) income, net (1,949) (245) 54
Earnings before income taxes 46,751 78,655 107,307
Income tax expense 20,442 27,143 36,737
Net earnings $ 26,309 $ 51,512 $ 70,570
Earnings per share:      
Basic $ 2.23 $ 4.01 $ 5.50
Diluted $ 2.22 $ 4.00 $ 5.47
Shares used in computing earnings per share:      
Basic 11,818 12,832 12,830
Diluted 11,855 12,882 12,901
Cash dividends declared per share $ 1.090 $ 0.920 $ 0.475