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Fair Value Measurement (Detail 2) (Contingent consideration, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Changes in liabilities measured at fair value for which the Company has used Level 3 inputs to determine fair value    
Balance at the beginning of the period $ 18,390 $ 14,511
Acquisition   18,050
Settlements   (19,608)
Change in fair value (18,390) 5,437
Balance at the end of the period   $ 18,390
Level 3 | Income approach | Minimum
   
Changes in liabilities measured at fair value for which the Company has used Level 3 inputs to determine fair value    
Discount rate (as a percent) 2.00%  
Level 3 | Income approach | Maximum
   
Changes in liabilities measured at fair value for which the Company has used Level 3 inputs to determine fair value    
Discount rate (as a percent) 6.00%