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Stock Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grant under the 2007 Plan (shares) 1,479,000   1,479,000  
Option vesting period (years)     4 years  
Percentage discount from fair market value for shares purchased under the Employee Stock Purchase Plan     85.00%  
Shares available for future issuance under the Employee Stock Purchase Plan (shares) 902,000   902,000  
Prior to October 1 2005 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration period for grants (years)     10 years  
After October 1 2005 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration period for grants (years)     7 years  
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option Cliff vesting period     6 months  
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option Cliff vesting period     1 year  
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Wieghted average grant date fair value $ 10.80   $ 9.37 $ 7.81
Restricted Stock Units (RSUs) | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted Stock Units vesting period (years)     2 years  
Restricted Stock Units (RSUs) | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted Stock Units vesting period (years)     4 years  
Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense $ 8.7   $ 8.7  
Nonvested awards, total compensation cost not yet recognized, period for recognition (years)     2 years 4 months 24 days  
Employee Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense 0.1   0.1  
Nonvested awards, total compensation cost not yet recognized, period for recognition (years)     1 month  
Wieghted average grant date fair value $ 0.00 $ 0.00 $ 2.98 $ 3.18
Shares purchased under the ESPP (shares)     97,000 67,000
Employee Stock Purchase Plan Amount Purchased     $ 0.7 $ 0.3