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Business Combinations - Additional Information (Details)
customer in Thousands, $ in Thousands
Jan. 12, 2015
USD ($)
customer
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Business Acquisition [Line Items]      
Goodwill   $ 818,952 $ 779,928
TONBELLER      
Business Acquisition [Line Items]      
Common stock acquired (percent) 100.00%    
Number of customers (more than a thousand) | customer 1    
Weighted average useful life 4 years 11 months    
Goodwill $ 46,193    
Completed technology | TONBELLER      
Business Acquisition [Line Items]      
Weighted average useful life 5 years    
Customer relationships | TONBELLER      
Business Acquisition [Line Items]      
Weighted average useful life 5 years    
Trade names | TONBELLER      
Business Acquisition [Line Items]      
Weighted average useful life 3 years