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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Condensed Consolidated Statements Of Operations [Abstract]    
Operating revenues $ 147,370 $ 119,205
Cost of operating revenues 104,513 88,957
Gross profit 42,857 30,248
Operating expenses:    
Selling expense 7,321 6,944
General and administrative expense 10,118 8,940
Engineering and research expense 3,154 2,056
Environmental remediation expense   7,225
Total operating expenses 20,593 25,165
Operating income 22,264 5,083
Other income (expense):    
Interest expense (143) (143)
Interest income 138 96
Other income (expense), net 124 (595)
Earnings before income taxes 22,383 4,441
Income tax expense 7,655 1,520
Net earnings $ 14,728 $ 2,921
Earnings Per Share    
Basic $ 1.15 $ 0.23
Diluted $ 1.15 $ 0.23
Shares used in computing earnings per share    
Basic 12,756 12,682
Diluted 12,853 12,764
Cash dividends declared per share $ 0.115 $ 0.090