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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jul. 01, 2019
Cash paid for income taxes $ 1.0 $ 6.5 $ 11.7  
Cash paid for interest 9.5 11.6 3.0  
Non-cash investing and financing activities:        
Fair value adjustment on marketable investment securities recorded to stockholders' equity 0.7 $ 1.2 $ (0.4)  
Establishment of operation lease right-of-use assets and lease liabilities        
Operating lease right-of-use assets 66.0      
Operating lease liabilities (70.4)      
Accrued liabilities and other long-term liabilities 4.3      
ASU 2016-02 [Member]        
Establishment of operation lease right-of-use assets and lease liabilities        
Operating lease right-of-use assets 74.5     $ 74.5
Operating lease liabilities $ (78.8)     $ (78.8)