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Goodwill And Acquisition-Related Intangibles, Net (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
May 03, 2018
Minimum      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Asset, Useful Life 1 year    
Maximum      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Asset, Useful Life 9 years    
Weighted Average      
Finite-Lived Intangible Assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 11 months 4 years 3 months  
GameFly, Inc. [Member]      
Finite-Lived Intangible Assets      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 43
GameFly, Inc. [Member] | Weighted Average      
Finite-Lived Intangible Assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years