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Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Additional Information (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2015
term
Mar. 31, 2014
term
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jul. 31, 2014
USD ($)
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]            
Commitments under agreement     $ 41.1      
Capitalized Costs related to the build out of the IBM data center     54.7      
Capital commitment     7.5     $ 7.5
Remaining capital commitment     1.8      
Data processing and maintenance expense     99.9 $ 97.2 $ 102.1  
Facilities and equipment lease expense     36.5 39.1 39.5  
Software license expense     24.8 25.7 20.3  
Software and hardware maintenance expense     48.9 52.4 49.6  
Outstanding letter of credit     1.6      
Automatic Data Processing, Inc. [Member]            
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]            
Data processing and maintenance expense         5.8  
EU Information Technology Services Agreement [Member]            
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]            
Number of renewal terms option one | term   1        
Renewal term option one (in months)   12 months        
Expenses on agreements     4.6 1.5    
Capitalized Costs related to the build out of the IBM data center     5.6      
Amortization of capitalized costs     0.4      
Number of renewal terms option two | term   1        
Renewal term option two (in months)   24 months        
Information Technology Services Agreement [Member]            
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]            
Expiration date on agreement Jun. 30, 2024          
Agreement extension term 2 years          
Number of renewal terms option one | term 1          
Renewal term option one (in months) 12 months          
Commitments under agreement     533.9      
Expenses on agreements     95.3 95.7 96.3  
Amortization of capitalized costs     $ 5.1 $ 5.4 $ 5.9