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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]      
Proceeds from maturities and sales of marketable investment securities $ 165.6 $ 382.5 $ 385.3
Effect of foreign exchange rates on cash and cash equivalents (4.8) (0.6) (0.7)
Other receivables 1.9 3.2  
Trade accounts receivables $ 85.8 81.9  
Restatement Adjustment      
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]      
Proceeds from maturities and sales of marketable investment securities   (0.6) (0.7)
Effect of foreign exchange rates on cash and cash equivalents   0.6 $ 0.7
Other receivables   (0.6)  
Trade accounts receivables   $ 0.6  
Equipment | Minimum      
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]      
Estimated useful lives, in years 5 years    
Equipment | Maximum      
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]      
Estimated useful lives, in years 7 years    
Leasehold Improvements | Minimum      
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]      
Estimated useful lives, in years 3 years    
Leasehold Improvements | Maximum      
Organization and Summary of Significant Accounting Policies Disclosure [Line Items]      
Estimated useful lives, in years 15 years