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Summary of Significant Accounting Policies Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Revenue from contracts with customers $ 322,114    
Scenario, Previously Reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in restricted cash   $ 619  
Accounting Standards Update 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of change in accounting for employee share-based payments     $ 3,926
Revenue from contracts with customers $ 15,000