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Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 24, 2017
Jul. 25, 2016
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Apr. 30, 2019
Schedule of Equity Method Investments [Line Items]            
Payments to acquire       $ 0 $ 5,000  
Equity method investment, gain     $ 15,800 $ 15,769 $ 0  
SDC            
Schedule of Equity Method Investments [Line Items]            
Ownership 2.00% 17.00%        
Payments to acquire $ 12,800 $ 46,700        
SDC            
Schedule of Equity Method Investments [Line Items]            
Derecognized equity method investment           $ 38,400
Short-term notes receivable | SDC            
Schedule of Equity Method Investments [Line Items]            
Promissory note receivable           $ 54,200