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Goodwill and Intangible Assets Goodwill Impairment Assessment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Goodwill $ 3,238,410 $ 3,247,105   $ 3,238,410    
Goodwill and Intangible Asset Impairment 0   $ 137,907 0 $ 137,907  
Other Asset Impairment Charges       0 1,780  
Automotive Segment [Member]            
Goodwill $ 1,116,453 1,119,947 1,080,500 $ 1,116,453 1,080,500  
Dragon TV [Member]            
Goodwill     12,000   12,000  
Mobile Reporting Unit [Member]            
Goodwill     36,000   36,000  
Goodwill, Impairment Loss   400     35,100  
Goodwill and Intangible Asset Impairment   15,000        
Other Asset Impairment Charges   6,200        
SRS [Member]            
Goodwill     17,800   17,800  
Goodwill, Impairment Loss   3,400     102,800  
Fair Value, Net Asset (Liability)     $ 94,300   $ 94,300  
Goodwill, Subsequent Recognition of Deferred Tax Asset           $ 8,500
Goodwill and Intangible Asset Impairment   25,100        
Other Asset Impairment Charges   900        
Customer Relationships [Member] | Mobile Reporting Unit [Member]            
Impairment of Intangible Assets (Excluding Goodwill)   7,600        
Customer Relationships [Member] | SRS [Member]            
Impairment of Intangible Assets (Excluding Goodwill)   12,900        
Patented Technology [Member] | Mobile Reporting Unit [Member]            
Impairment of Intangible Assets (Excluding Goodwill)   800        
Patented Technology [Member] | SRS [Member]            
Impairment of Intangible Assets (Excluding Goodwill)   $ 7,900