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Income Taxes (Details 3) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Income Taxes      
Statutory federal income tax rate (as a percent) 34.00% 34.00% 34.00%
Increase (decrease) in taxes resulting from:      
State taxes (as a percent) 6.00% 3.00% 4.00%
Foreign taxes (as a percent) (12.00%) 11.00% 31.00%
Meals and entertainment (as a percent) 2.00% (2.00%) 6.00%
Acquisition costs (as a percent)   (9.00%)  
Incentive stock options (as a percent) 4.00% (9.00%) 66.00%
Change in valuation allowance and utilization of net operating loss carryforward (as a percent) 4.00%   17.00%
R&D credits (as a percent) (2.00%) 1.00% (15.00%)
Return to provision and true up adjustments (as a percent) 1.00% (2.00%) 46.00%
Change in reserves (as a percent) (1.00%) 1.00% (4.00%)
Rate adjustment on deferred taxes (as a percent) (2.00%) 7.00% 18.00%
DPAD (as a percent)     (10.00%)
Other (as a percent)   (3.00%) 1.00%
Effective income tax rate (as a percent) 34.00% 32.00% 194.00%
Unrecognized Tax Benefits      
Gross unrecognized tax benefit which would benefit effective tax rate if the company were to prevail on all unrecognized tax benefits $ 43,000    
Reconciliation of unrecognized tax benefit      
Balance at the beginning of the period 55,902 46,327  
Increases/(decreases) as a result of tax positions taken during a prior period 3,997 1,846  
Increases/(decreases) as a result of expiration of jurisdiction statutes of limitations (21,444)    
Increases/(decreases) as a result of tax positions taken during the current period (including interest) 5,040 7,729  
Balance at the end of the period $ 43,495 $ 55,902 $ 46,327