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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]        
Net income $ 2,307 $ 3,615 $ 5,153 $ 8,170
Denominator for basic net income per common share — weighted average shares outstanding 25,770,000 25,369,000 25,705,000 25,236,000
Effect of dilutive securities [Abstract]        
Employee stock options and employee stock purchase plan 273,000 510,000 433,000 451,000
Denominator for diluted net income per common share — adjusted weighted average shares 26,043,000 25,879,000 26,138,000 25,687,000
Net income per common share, basic $ 0.09 $ 0.14 $ 0.20 $ 0.32
Net income per common share, diluted $ 0.09 $ 0.14 $ 0.20 $ 0.32
Antidilutive securities excluded from computation of earnings per share 3,254,285 1,921,684 2,019,690 1,767,934