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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 169,936 $ 219,542 $ 470,411 $ 542,451
Cost of operating revenues 121,687 156,506 339,339 386,194
Gross profit 48,249 63,036 131,072 156,257
Operating expenses:        
Selling expense 9,954 8,674 29,244 23,995
General and administrative expense 10,002 11,783 31,099 32,056
Engineering and research expense 3,071 3,029 8,602 8,946
Total operating expenses 23,027 23,486 68,945 64,997
Operating income 25,222 39,550 62,127 91,260
Other income (expense):        
Interest expense (45) (32) (140) (258)
Interest income 295 100 587 367
Other income (expense), net 28 132 (468) 252
Earnings before income taxes 25,500 39,750 62,106 91,621
Income tax expense 9,001 13,687 21,923 31,479
Net earnings $ 16,499 $ 26,063 $ 40,183 $ 60,142
Earnings per share:        
Basic $ 1.28 $ 2.03 $ 3.12 $ 4.69
Diluted $ 1.28 $ 2.01 $ 3.11 $ 4.66
Shares used in computing earnings per share:        
Basic 12,843 12,858 12,881 12,819
Diluted 12,889 12,947 12,927 12,894
Cash dividends declared per share $ 0.260 $ 0.115 $ 0.650 $ 0.345