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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income $ 9,305 $ 12,138 $ 23,508 $ 17,804
Denominator:        
Weighted average basic shares 11,941 11,812 11,932 11,782
Dilutive effect of stock options and restricted stock units 75 49 75 52
Weighted average diluted shares with assumed conversions 12,016 11,861 12,007 11,834
Net earnings per share:        
Basic $ 0.78 $ 1.03 $ 1.97 $ 1.51
Diluted $ 0.77 $ 1.02 $ 1.96 $ 1.50