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Related Party Transactions Narrative (Details)
$ in Millions
3 Months Ended
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]  
Ownership Percent Of Class A Stock By Controlling Stockholder 79.80%
Ownership Percent Of Class A And Class B Stock By Controlling Stockholder 10.00%
Percentage Of Voting Interest Controlled By The Chairman Of The Controlling Stockholder Entity 80.00%
Percentage Of Voting Interest Controlled By Non-Chairman Member Of The Controlling Stockholder Entity 20.00%
NAI  
Related Party Transaction [Line Items]  
Revenue from Related Parties $ 1