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Debt - Convertible Note Hedge and Warrant Transactions (Details) - $ / shares
shares in Thousands
Jul. 25, 2020
Sep. 15, 2015
Convertible senior notes    
Debt Instrument [Line Items]    
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) $ 96.89  
Note Warrant    
Debt Instrument [Line Items]    
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) $ 130.43  
Warrant    
Debt Instrument [Line Items]    
Class of Warrant or Right, Unissued (shares) 601  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares)   5,006