Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

v3.8.0.1
Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Nov. 30, 2014
Oct. 31, 2014
Debt Instrument        
Total debt, gross $ 2,475,000 $ 2,946,250    
Unamortized discount (2,614) (2,901)    
Unamortized debt issuance costs (10,472) (12,892)    
Total debt, net of discount 2,461,914 2,930,457    
Current portion of long-term debt 0 249,983    
Long-term debt 2,461,914 2,680,474    
Senior notes        
Debt Instrument        
Unamortized discount     $ (4,000)  
Term loans        
Debt Instrument        
Total debt, gross $ 0 $ 446,250    
Effective interest rate 0.00% 2.137%    
Line of credit | Revolving Credit Facility        
Debt Instrument        
Total debt, gross $ 225,000 $ 0    
Effective interest rate 2.913% 0.00%    
Fixed-rate 2.375% Senior notes due on November 1, 2017 | Senior notes        
Debt Instrument        
Stated interest rate 2.375%      
Total debt, gross $ 0 $ 250,000    
Effective interest rate 0.00% 2.396%    
Fixed-rate 3.375% Senior notes due on November 1, 2019 | Senior notes        
Debt Instrument        
Stated interest rate 3.375%      
Total debt, gross $ 250,000 $ 250,000    
Effective interest rate 3.377% 3.377%    
Fixed-rate 4.125% Senior notes due on November 1, 2021 | Senior notes        
Debt Instrument        
Stated interest rate 4.125%      
Total debt, gross $ 500,000 $ 500,000    
Effective interest rate 4.128% 4.128%    
Fixed-rate 4.650% Senior notes due on November 1, 2024 | Senior notes        
Debt Instrument        
Stated interest rate 4.65% [1]     4.65%
Total debt, gross [1] $ 1,250,000 $ 1,250,000    
Effective interest rate [1] 4.682% 4.682%    
Fixed-rate 5.650% Senior notes due on November 1, 2034 | Senior notes        
Debt Instrument        
Stated interest rate 5.65%      
Total debt, gross $ 250,000 $ 250,000    
Effective interest rate 5.67% 5.67%    
Portion of senior notes | Cash flow hedge contracts | Senior notes | Treasury lock | Derivatives designated as hedging instruments        
Debt Instrument        
Effective percentage including treasury rate lock hedge 4.626%      
[1] The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.