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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Condensed Consolidated Statements Of Operations [Abstract]    
Operating revenues $ 119,205 $ 89,166
Cost of operating revenues 88,957 64,943
Gross profit 30,248 24,223
Operating expenses:    
Selling expense 6,944 7,018
General and administrative expense 8,940 7,318
Engineering and research expense 2,056 2,564
Environmental remediation expense 7,225 713
Total operating expenses 25,165 17,613
Operating income 5,083 6,610
Other income (expense):    
Interest expense (143) (186)
Interest income 96 42
Other income (expense), net (595) 111
Earnings before income taxes 4,441 6,577
Income tax provision 1,520 2,291
Net earnings $ 2,921 $ 4,286
Basic net earnings per share $ 0.23 $ 0.34
Diluted net earnings per share $ 0.23 $ 0.34
Weighted average shares outstanding 12,682 12,502
Diluted effect of stock equivalents 82 142
Weighted average shares outstanding assuming dilution 12,764 12,644
Cash dividends per share $ 0.090 $ 0.085