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Indebtedness - Issuances and Principal Repayment (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 26, 2017
Apr. 24, 2017
Mar. 15, 2017
Jan. 13, 2017
Sep. 30, 2017
Sep. 30, 2016
Oct. 29, 2017
Indebtedness              
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses         $ 598,246 $ 737,612  
Repurchase of convertible senior notes         $ 8,478 $ 0  
Senior unsecured notes, due 2027 at 4.95%              
Indebtedness              
Interest rate, stated percentage         4.95%    
Senior unsecured notes, due 2018 at 6.70%              
Indebtedness              
Interest rate, stated percentage         6.70%    
Senior unsecured notes              
Indebtedness              
Issuance of senior notes       $ 600,000      
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses       593,228      
Senior unsecured notes | Senior unsecured notes, due 2023 at 4.5%              
Indebtedness              
Issuance of senior notes       $ 200,000      
Interest rate, stated percentage       4.50%      
Senior unsecured notes | Senior unsecured notes, due 2027 at 4.95%              
Indebtedness              
Issuance of senior notes       $ 400,000      
Interest rate, stated percentage       4.95%      
Senior unsecured notes | Senior unsecured notes, due 2027 at 3.8%              
Indebtedness              
Interest rate, stated percentage     3.80%        
Repurchase of convertible senior notes   $ 47 $ 8,431        
Subsequent event | Senior unsecured notes | Senior unsecured notes, due 2028 at 3.950%              
Indebtedness              
Issuance of senior notes $ 400,000            
Interest rate, stated percentage 3.95%            
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses $ 388,244            
Subsequent event | Senior unsecured notes | Senior unsecured notes, due 2018 at 6.70%              
Indebtedness              
Interest rate, stated percentage             6.70%
Repurchased face amount             $ 350,000