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Business Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Feb. 27, 2015
Jun. 30, 2014
Jun. 30, 2013
Business Acquisition [Line Items]        
Goodwill $ 177.2   $ 169.2 $ 56.9
German Clinic [Member]        
Business Acquisition [Line Items]        
Current assets   $ 3.1    
Real property   20.7    
Equipment   1.6    
Goodwill   8.1    
Current liabilities   (4.4)    
Long-term liabilities   (9.0)    
Total purchase price   $ 20.1