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Condensed Consolidated Statements Of Operations (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Condensed Consolidated Statements Of Operations [Abstract]    
Operating revenues $ 147,671,000 $ 147,370,000
Cost of operating revenues 107,520,000 104,513,000
Gross profit 40,151,000 42,857,000
Operating expenses:    
Selling expense 9,756,000 7,321,000
General and administrative expense 11,743,000 10,118,000
Engineering and research expense 2,660,000 3,154,000
Total operating expenses 24,159,000 20,593,000
Operating income 15,992,000 22,264,000
Other income (expense):    
Interest expense (39,000) (143,000)
Interest income 135,000 138,000
Other income (expense), net (271,000) 124,000
Earnings before income taxes 15,817,000 22,383,000
Income tax expense 5,583,000 7,655,000
Net earnings $ 10,234,000 $ 14,728,000
Earnings per share:    
Basic $ 0.79 $ 1.15
Diluted $ 0.79 $ 1.15
Shares used in computing earnings per share:    
Basic 12,889 12,756
Diluted 12,951 12,853
Cash dividends declared per share $ 0.130 $ 0.115