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Debt | Senior Notes (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Jan. 31, 2017
Oct. 31, 2017
Oct. 31, 2016
Feb. 27, 2017
Sep. 30, 2012
Debt Instrument          
Proceeds from Issuance of Long-term Debt   $ 1,008,148 $ 0    
Other Committed And Uncommitted Revolving Credit Facilities          
Debt Instrument          
Line of Credit Facility, Interest Rate at Period End 8.35% 6.10%      
Senior Notes | 2017 Senior Notes          
Debt Instrument          
Proceeds from Issuance of Long-term Debt $ 989,800        
Debt Instrument, Unamortized Discount 1,600        
Debt Issuance Costs, Gross 8,600        
Senior Notes | 3.70% Senior Notes          
Debt Instrument          
Debt Instrument, Redemption Price, Discounted Scheduled Payments, Discount Rate, Basis Spread on Variable Rate       0.30%  
Debt Instrument, Face Amount $ 500,000 $ 500,000      
Debt Instrument, Interest Rate, Stated Percentage 3.70%        
Senior Notes | 4.95% Senior Notes          
Debt Instrument          
Debt Instrument, Redemption Price, Discounted Scheduled Payments, Discount Rate, Basis Spread on Variable Rate       0.40%  
Debt Instrument, Face Amount $ 500,000 500,000      
Debt Instrument, Interest Rate, Stated Percentage 4.95%        
Senior Notes | 3.75% Senior Notes          
Debt Instrument          
Debt Instrument, Redemption Price, Discounted Scheduled Payments, Discount Rate, Basis Spread on Variable Rate         0.50%
Debt Instrument, Face Amount $ 350,000 $ 0     $ 350,000
Debt Instrument, Interest Rate, Stated Percentage         3.75%