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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, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 172,099 $ 153,446 $ 423,438 $ 362,780
Cost of operating revenues 123,071 111,947 307,668 263,049
Gross profit 49,028 41,499 115,770 99,731
Operating expenses:        
Selling expense 7,324 6,929 21,136 20,858
General and administrative expense 10,390 8,178 27,764 22,761
Engineering and research expense 2,527 2,789 6,827 8,125
Environmental remediation expense   462 7,225 1,175
Total operating expenses 20,241 18,358 62,952 52,919
Operating income 28,787 23,141 52,818 46,812
Other income (expense):        
Interest expense (103) (192) (376) (591)
Interest income 137 71 327 150
Other income (expense), net (234) 139 (314) 366
Earnings before income taxes 28,587 23,159 52,455 46,737
Income tax provision 9,764 7,870 17,937 15,837
Net earnings $ 18,823 $ 15,289 $ 34,518 $ 30,900
Basic net earnings per share $ 1.48 $ 1.22 $ 2.72 $ 2.46
Diluted net earnings per share $ 1.47 $ 1.20 $ 2.70 $ 2.44
Weighted average shares outstanding 12,714 12,564 12,700 12,538
Diluted effect of stock equivalents 100 139 99 139
Weighted average shares outstanding assuming dilution 12,814 12,703 12,799 12,677
Cash dividends per share $ 0.090 $ 0.085 $ 0.270 $ 0.255