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Share-Based Compensation: (Details 2) (Stock options, USD $)
 12 Months Ended
Sep. 30, 2012
1998 Plan
  
Information about stock options, by exercise price range  
Options outstanding at the end of the period (in shares) 376,200
Options Outstanding - Weighted-Average Remaining Contractual Life 1 year 10 months 24 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 8.62
Options exercisable at the end of the period (in shares) 366,200
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 8.64
1998 Plan | Range of Exercise Price - $ - - $ 5.00
  
Information about stock options, by exercise price range  
Exercise price, high end of range (in dollars per share) $ 5.00
Options outstanding at the end of the period (in shares) 181,800
Options Outstanding - Weighted-Average Remaining Contractual Life 7 months 6 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 4.21
Options exercisable at the end of the period (in shares) 181,800
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 4.21
1998 Plan | Range of Exercise Price - $ 5.01 - $ 10.00
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 5.01
Exercise price, high end of range (in dollars per share) $ 10.00
Options outstanding at the end of the period (in shares) 101,400
Options Outstanding - Weighted-Average Remaining Contractual Life 3 years 3 months 18 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 7.60
Options exercisable at the end of the period (in shares) 91,400
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 7.58
1998 Plan | Range of Exercise Price - $ 10.01 - $ 15.00
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 10.01
Exercise price, high end of range (in dollars per share) $ 15.00
Options outstanding at the end of the period (in shares) 47,500
Options Outstanding - Weighted-Average Remaining Contractual Life 2 years 6 months
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 13.62
Options exercisable at the end of the period (in shares) 47,500
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 13.62
1998 Plan | Range of Exercise Price - $ 15.01 - $ 20.00
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 15.01
Exercise price, high end of range (in dollars per share) $ 20.00
Options outstanding at the end of the period (in shares) 12,000
Options Outstanding - Weighted-Average Remaining Contractual Life 2 years 6 months
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 16.93
Options exercisable at the end of the period (in shares) 12,000
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 16.93
1998 Plan | Range of Exercise Price - $ 20.01 - $ 27.00
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 20.01
Exercise price, high end of range (in dollars per share) $ 27.00
Options outstanding at the end of the period (in shares) 33,500
Options Outstanding - Weighted-Average Remaining Contractual Life 4 years 3 months 18 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 25.57
Options exercisable at the end of the period (in shares) 33,500
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 25.57
2009 Plan
  
Information about stock options, by exercise price range  
Options outstanding at the end of the period (in shares) 460,000
Options Outstanding - Weighted-Average Remaining Contractual Life 9 years 2 months 12 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 4.45
Options exercisable at the end of the period (in shares) 60,003
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 5.28
2009 Plan | Range of Exercise Price - $ - - $ 5.00
  
Information about stock options, by exercise price range  
Exercise price, high end of range (in dollars per share) $ 5.00
Options outstanding at the end of the period (in shares) 280,000
Options Outstanding - Weighted-Average Remaining Contractual Life 9 years 4 months 24 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 3.92
2009 Plan | Range of Exercise Price - $ 5.01 - $ 10.00
  
Information about stock options, by exercise price range  
Exercise price, low end of range (in dollars per share) $ 5.01
Exercise price, high end of range (in dollars per share) $ 10.00
Options outstanding at the end of the period (in shares) 180,000
Options Outstanding - Weighted-Average Remaining Contractual Life 8 years 10 months 24 days
Options Outstanding - Weighted-Average Exercise Price (in dollars per share) $ 5.28
Options exercisable at the end of the period (in shares) 60,003
Options Exercisable - Weighted-Average Exercise Price (in dollars per share) $ 5.28