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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 9 Months Ended 34 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Nov. 30, 2012
Annual Equity Program [Member]
Nov. 30, 2011
Annual Equity Program [Member]
Aug. 31, 2011
Annual Equity Program [Member]
Aug. 31, 2010
Annual Equity Program [Member]
Aug. 31, 2010
Retention Awards Program [Member]
Jun. 30, 2013
Executive Officers And Board Of Directors [Member]
Jun. 30, 2013
Other Employees [Member]
Apr. 24, 2013
October 25, 2011 Program [Member]
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Aug. 02, 2013
Subsequent Event [Member]
Revenue Recognition                              
Domestic accounts receivable terms of payment                         30 days 45 days  
International accounts receivable terms of payment                         30 days 120 days  
VSOE Percentage Which Constitutes Substantial Majority of Transactions Priced Within a Narrow Range     80.00%                        
Range of VSOE to median sales price     15.00%                        
Stock-Based Compensation                              
Share-based compensation expense $ 27,900,000 $ 23,500,000 $ 82,200,000 $ 69,000,000                      
Unrecognized stock-based compensation cost 100,800,000   100,800,000                        
Unrecognized stock-based compensation cost, period for recognition     2 years                        
Rate for grant awarded                   5.80% 7.90%        
Approved RSUs to employees and executive officers pursuant to the Company's annual equity awards program         290,415 82,968 170,390 181,334 83,000            
Percentage of the aggregate number of RSUs granted that vest in equal quarterly increments         50.00% 50.00% 50.00% 50.00%              
Portion of RSU grant subject to Company achieving specified quarterly revenue and EBITDA goals         0.125 0.16700 0.16700                
Annual equity awards program vesting period         4 years 3 years 3 years 3 years              
Percentage of quarterly performance stock grant based on achieving quarterly revenue goal         50.00%                    
Percentage of quarterly revenue goal to be achieved for performance stock grant         80.00%                    
Percentage of quarterly performance stock grant based on achieving EBITDA goal         50.00%                    
Percentage of achievement threshold to which the goals are entitled         80.00%                    
Threshold percentage of targeted goals above which quarterly performance stock grant is paid linearly         80.00%                    
Percentage of over-achievement threshold to which the goals are entitled         100.00%                    
Percentage of annual equity awards RSU grant subject to performance based vesting         37.50% 33.33% 33.33%                
Percentage of annual equity awards RSU grant subject to performance based vesting in each period         12.50% 16.66% 16.66%                
Common Stock Repurchase                              
Stock repurchase program, authorized amount     600,000,000                 200,000,000      
Shares repurchased and retired                             10,919,493
Average price of shares repurchased                             $ 70.68
Stock repurchase program, remaining authorized amount to repurchase shares                             $ 227,800,000