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Condensed Consolidated Statements Of Operations (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 152,804,000 $ 175,539,000 $ 300,475,000 $ 322,909,000
Cost of operating revenues 110,132,000 125,175,000 217,652,000 229,688,000
Gross profit 42,672,000 50,364,000 82,823,000 93,221,000
Operating expenses:        
Selling expense 9,534,000 8,000,000 19,290,000 15,321,000
General and administrative expense 9,354,000 10,155,000 21,097,000 20,273,000
Engineering and research expense 2,871,000 2,763,000 5,531,000 5,917,000
Total operating expenses 21,759,000 20,918,000 45,918,000 41,511,000
Operating income 20,913,000 29,446,000 36,905,000 51,710,000
Other income (expense):        
Interest expense (56,000) (83,000) (95,000) (226,000)
Interest income 157,000 129,000 292,000 267,000
Other income (expense), net (225,000) (4,000) (496,000) 120,000
Earnings before income taxes 20,789,000 29,488,000 36,606,000 51,871,000
Income tax expense 7,339,000 10,137,000 12,922,000 17,792,000
Net earnings $ 13,450,000 $ 19,351,000 $ 23,684,000 $ 34,079,000
Earnings per share:        
Basic $ 1.04 $ 1.51 $ 1.84 $ 2.66
Diluted $ 1.04 $ 1.50 $ 1.83 $ 2.65
Shares used in computing earnings per share:        
Basic 12,910 12,842 12,899 12,799
Diluted 12,942 12,882 12,947 12,867
Cash dividends declared per share $ 0.260 $ 0.115 $ 0.390 $ 0.230