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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Consolidated Statements Of Operations [Abstract]      
Operating revenues $ 617,933 $ 690,848 $ 551,255
Cost of operating revenues 446,938 496,014 402,737
Gross profit 170,995 194,834 148,518
Operating expenses:      
Selling expense 38,284 32,937 28,104
General and administrative expense 43,228 43,441 45,423
Engineering and research expense 11,125 11,395 9,481
Total operating expenses 92,637 87,773 83,008
Operating income 78,358 107,061 65,510
Interest expense (187) (304) (492)
Interest income 729 496 504
Other income (expense), net (245) 54 (414)
Earnings before income taxes 78,655 107,307 65,108
Income tax expense 27,143 36,737 21,831
Net earnings $ 51,512 $ 70,570 $ 43,277
Earnings per share:      
Basic $ 4.01 $ 5.50 $ 3.41
Diluted $ 4.00 $ 5.47 $ 3.38
Shares used in computing earnings per share:      
Basic 12,832 12,830 12,704
Diluted 12,882 12,901 12,810
Cash dividends declared per share $ 0.920 $ 0.475 $ 0.385