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Debt (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 01, 2016
USD ($)
Aug. 04, 2014
USD ($)
Sep. 12, 2013
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2017
USD ($)
Oct. 31, 2016
USD ($)
Line of Credit Facility [Line Items]              
Term loans         $ 1,103,800,000 $ 1,103,800,000 $ 1,111,200,000
Required minimum Interest coverage ratio           3.00  
Required maximum total leverage ratio           3.75  
Interest coverage ratio         23.95 23.95  
Total leverage ratio         1.87 1.87  
Amount available under the credit agreement         $ 754,800,000 $ 754,800,000  
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     $ 300,000,000.000000   $ 285,000,000 $ 285,000,000  
Debt instrument, maturity date     Sep. 12, 2018        
Debt Instrument, Issuance Date     Sep. 12, 2013        
Debt term     5 years        
Repayments of Debt             $ 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%  
Subsequent Event [Member] | Term Loan $300M [Member]              
Line of Credit Facility [Line Items]              
Repayments of Debt       $ 285,000,000