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Investments - Schedule of Losses of Equity Affiliates (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2012
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2013
Apr. 30, 2018
Schedule of Equity Method Investments [Line Items]                
Impairments of investment   $ 13.0   $ 227.0        
Long-term growth rates         (1.90%)      
Foxtel [Member]                
Schedule of Equity Method Investments [Line Items]                
Impairments of investment     $ 957.0 $ 227.0        
Long-term growth rates         2.00% 2.50%    
Discount rates         10.25% 9.00%    
Fair value control premium           10.00%    
Equity method investment, ownership percentage               50.00%
Foxtel [Member] | Consolidated Media Holdings [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage 25.00%              
Business acquisition date Nov. 30, 2012              
Other Equity Affiliates, Net [Member]                
Schedule of Equity Method Investments [Line Items]                
Impairments of investment         $ 13.0 $ 9.0    
Fox Sports [Member] | Consolidated Media Holdings [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage 50.00%              
Business acquisition recognized gain resulting from remeasurement of previously held equity interest             $ 1,300.0  
Ownership percentage 25.00%              
Fox Sports Foxtel CMH [Member]                
Schedule of Equity Method Investments [Line Items]                
Business acquisition recognized gain resulting from remeasurement of previously held equity interest             $ 0.9  
Equity Losses of Affiliates [Member] | Foxtel [Member]                
Schedule of Equity Method Investments [Line Items]                
Amortization of excess basis allocated to finite-lived intangible assets         $ 49.0 $ 68.0