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Business Acquisitions (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Other Acquisitions [Member]
Sep. 30, 2014
Other Acquisitions [Member]
Jul. 01, 2014
Other Acquisitions [Member]
Business Acquisition [Line Items]          
Business Acquisition, Cost of Acquired Entity, Purchase Price, Total     $ 138.3 $ 119.6  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 19.8       12.0
Goodwill     81.6    
Identifiable intangible assets     53.0    
Weighted average life     9 years 5 months    
Business Combination Acquisition Related Adjustments $ 7.7 $ 17.8