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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 132,134 $ 120,168 $ 251,339 $ 209,334
Cost of operating revenues 95,640 86,159 184,597 151,102
Gross profit 36,494 34,009 66,742 58,232
Operating expenses:        
Selling expense 6,868 6,911 13,812 13,929
General and administrative expense 8,434 7,265 17,374 14,583
Engineering and research expense 2,244 2,772 4,300 5,336
Environmental remediation expense     7,225 713
Total operating expenses 17,546 16,948 42,711 34,561
Operating income 18,948 17,061 24,031 23,671
Other income (expense):        
Interest expense (130) (213) (273) (399)
Interest income 94 37 190 79
Other income (expense), net 515 116 (80) 227
Earnings before income taxes 19,427 17,001 23,868 23,578
Income tax provision 6,653 5,676 8,173 7,967
Net earnings $ 12,774 $ 11,325 $ 15,695 $ 15,611
Basic net earnings per share $ 1.01 $ 0.90 $ 1.24 $ 1.24
Diluted net earnings per share $ 1.00 $ 0.89 $ 1.23 $ 1.23
Weighted average shares outstanding 12,703 12,548 12,692 12,525
Diluted effect of stock equivalents 118 137 100 139
Weighted average shares outstanding assuming dilution 12,821 12,685 12,792 12,664
Cash dividends per share $ 0.090 $ 0.085 $ 0.180 $ 0.170