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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, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 219,542 $ 172,099 $ 542,451 $ 423,438
Cost of operating revenues 156,506 123,071 386,194 307,668
Gross profit 63,036 49,028 156,257 115,770
Operating expenses:        
Selling expense 8,674 7,324 23,995 21,136
General and administrative expense 11,783 10,390 32,056 27,764
Engineering and research expense 3,029 2,527 8,946 6,827
Environmental remediation expense       7,225
Total operating expenses 23,486 20,241 64,997 62,952
Operating income 39,550 28,787 91,260 52,818
Other income (expense):        
Interest expense (32) (103) (258) (376)
Interest income 100 137 367 327
Other income (expense), net 132 (234) 252 (314)
Earnings before income taxes 39,750 28,587 91,621 52,455
Income tax expense 13,687 9,764 31,479 17,937
Net earnings $ 26,063 $ 18,823 $ 60,142 $ 34,518
Earnings per share:        
Basic $ 2.03 $ 1.48 $ 4.69 $ 2.72
Diluted $ 2.01 $ 1.47 $ 4.66 $ 2.70
Shares used in computing earnings per share:        
Basic 12,858 12,714 12,819 12,700
Diluted 12,947 12,814 12,894 12,799
Cash dividends declared per share $ 0.115 $ 0.090 $ 0.345 $ 0.270