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Marketable Investment Securities - Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
[1]
Jun. 30, 2017
[1]
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost $ 84.9 $ 110.9 [1] $ 97.4 $ 102.4
Available-for-sale, Amortized cost 189.9 211.9    
Gross unrealized holding gains 0.2      
Gross unrealized holding losses (0.1) (0.6)    
Available-for-sale, Estimated fair value 190.0 211.3    
Amortized cost 189.9 211.9    
Estimated fair value 190.0 211.3    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 70.3 95.6    
Cash and cash equivalents, Estimated fair value 70.3 95.6    
Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 14.6 15.3    
Cash and cash equivalents, Estimated fair value 14.6 15.3    
Total Cash and Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 84.9 110.9    
Cash and cash equivalents, Estimated fair value 84.9 110.9    
Corporate Bonds and Notes [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale, Amortized cost 67.5 50.8    
Gross unrealized holding gains 0.2      
Gross unrealized holding losses (0.1) (0.3)    
Available-for-sale, Estimated fair value 67.6 50.5    
Municipal Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale, Amortized cost 18.1 29.3    
Gross unrealized holding losses   (0.1)    
Available-for-sale, Estimated fair value 18.1 29.2    
Federal Agency Issues [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale, Amortized cost 12.1 12.6    
Gross unrealized holding losses   (0.1)    
Available-for-sale, Estimated fair value 12.1 12.5    
US Government Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale, Amortized cost 7.3 8.3    
Gross unrealized holding losses   (0.1)    
Available-for-sale, Estimated fair value $ 7.3 $ 8.2    
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.