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Subsequent Event (Details) - USD ($)
Dec. 07, 2016
Dec. 06, 2016
Nov. 30, 2016
Credit Agreement      
Subsequent Event      
Maximum revolving commitment     $ 650,000,000
Credit Agreement | Subsequent event      
Subsequent Event      
Maximum revolving commitment $ 1,000,000,000 $ 650,000,000  
Maximum leverage ratio allowed during the fiscal quarter immediately prior to a qualified acquisition being consummated 3.50%    
Maximum leverage ratio allowed during the fiscal quarter that a qualified acquisition is consummated 4.25%    
Maximum leverage ratio allowed during the first three quarters after a qualified acquisition is consummated 4.00%    
Maximum leverage ratio allowed during the fourth quarter after a qualified acquisition is consummated 3.75%    
Revolving loan | Subsequent event      
Subsequent Event      
Maximum revolving commitment $ 200,000,000 $ 150,000,000