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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. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Condensed Consolidated Statements Of Operations [Abstract]        
Operating revenues $ 175,539 $ 132,134 $ 322,909 $ 251,339
Cost of operating revenues 125,175 95,640 229,688 184,597
Gross profit 50,364 36,494 93,221 66,742
Operating expenses:        
Selling expense 8,000 6,868 15,321 13,812
General and administrative expense 10,155 8,434 20,273 17,374
Engineering and research expense 2,763 2,244 5,917 4,300
Environmental remediation expense       7,225
Total operating expenses 20,918 17,546 41,511 42,711
Operating income 29,446 18,948 51,710 24,031
Other income (expense):        
Interest expense (83) (130) (226) (273)
Interest income 129 94 267 190
Other income (expense), net (4) 515 120 (80)
Earnings before income taxes 29,488 19,427 51,871 23,868
Income tax expense 10,137 6,653 17,792 8,173
Net earnings $ 19,351 $ 12,774 $ 34,079 $ 15,695
Earnings Per Share        
Basic $ 1.51 $ 1.01 $ 2.66 $ 1.24
Diluted $ 1.50 $ 1.00 $ 2.65 $ 1.23
Shares used in computing earnings per share        
Basic 12,842 12,703 12,799 12,692
Diluted 12,882 12,821 12,867 12,792
Cash dividends declared per share $ 0.115 $ 0.090 $ 0.230 $ 0.180