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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Mar. 01, 2016
USD ($)
Aug. 04, 2014
USD ($)
Sep. 12, 2013
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Line of Credit Facility [Line Items]              
Term loans         $ 830,000,000 $ 830,000,000 $ 1,111,200,000
Required minimum Interest coverage ratio           3.00  
Required maximum total leverage ratio           3.75  
Interest coverage ratio         24.08 24.08  
Total leverage ratio         1.70 1.70  
Amount available under the credit agreement         $ 645,700,000 $ 645,700,000  
Minimum [Member]              
Line of Credit Facility [Line Items]              
Commitment fee percentage   0.125%          
Maximum [Member]              
Line of Credit Facility [Line Items]              
Commitment fee percentage   0.25%          
2016 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, potential additional borrowing capacity   $ 750,000,000          
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Aggregate commitment amount of credit facility   $ 1,000,000,000.0          
2016 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility, initiation date   Mar. 01, 2016          
Term loans   $ 830,000,000     830,000,000 830,000,000  
Line of credit facility interest rate margin on base rate loans percentage   1.00%          
Line of credit facility interest rate margin on foreign currency loans percentage   1.75%          
2016 Credit Agreement [Member] | Federal Funds Rate [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate   0.00%          
2016 Credit Agreement [Member] | Eurodollar [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate   0.75%          
Line of Credit [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, maturity date   Mar. 01, 2021          
Term Loan $700M [Member]              
Line of Credit Facility [Line Items]              
Term loans     $ 700,000,000.0   0 0  
Debt instrument, maturity date     Aug. 04, 2017        
Debt Instrument, Issuance Date     Aug. 04, 2014        
Debt term     3 years        
Repayments of Debt $ 207,000,000           493,000,000
Term Loan $300M [Member]              
Line of Credit Facility [Line Items]              
Term loans       $ 300,000,000 0 $ 0  
Debt instrument, maturity date       Sep. 12, 2018      
Debt Instrument, Issuance Date       Sep. 12, 2013      
Debt term       5 years      
Repayments of Debt         $ 285,000,000   $ 15,000,000
Amortization of term loan principal       5.00%      
Debt instrument, date of first required payment       Oct. 31, 2016      
Medium-term Notes [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate           0.00%  
Medium-term Notes [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate           0.50%  
Medium-term Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate           0.75%  
Medium-term Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, basis spread on variable rate           1.50%