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Summary of Changes to Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Goodwill [Roll Forward]    
Beginning Balance $ 773,931 $ 757,504
Addition from acquisitions 5,129 17,457
Adjustment related to prior acquisitions 298  
Foreign currency translation adjustment 570 (1,030)
Ending Balance 779,928 773,931
Applications
    
Goodwill [Roll Forward]    
Beginning Balance 559,538 542,943
Addition from acquisitions 0 17,457
Adjustment related to prior acquisitions 298  
Foreign currency translation adjustment 459 (862)
Ending Balance 560,295 559,538
Scores
    
Goodwill [Roll Forward]    
Beginning Balance 146,648 146,648
Addition from acquisitions 0 0
Adjustment related to prior acquisitions 0  
Foreign currency translation adjustment 0 0
Ending Balance 146,648 146,648
Tools
    
Goodwill [Roll Forward]    
Beginning Balance 67,745 67,913
Addition from acquisitions 5,129 0
Adjustment related to prior acquisitions 0  
Foreign currency translation adjustment 111 (168)
Ending Balance $ 72,985 $ 67,745