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Long-term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Oct. 31, 2011
Jun. 30, 2018
Apr. 30, 2018
Jul. 31, 2015
Feb. 28, 2015
Jul. 31, 2018
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2012
Oct. 31, 2017
Mar. 31, 2017
Apr. 30, 2015
Debt Instrument [Line Items]                          
Term loan facility             $ 1,555,122,000            
Group of Banks [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, covenant compliance description             We were in compliance with all covenants at July 31, 2018.            
Weighted average interest rate for borrowings                         3.19%
Term loan                         $ 200,000,000
Repayment of term loan       $ 100,000,000                  
Term Loan Facility [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, covenant compliance description             We were in compliance with all covenants at July 31, 2018            
Term loan facility                       $ 705,000,000  
Term loan facility due in September 2018                       200,000,000  
Term loan facility due in March 2020                       200,000,000  
Term loan facility due in March 2022                       $ 305,000,000  
Weighted average interest rate for borrowings             3.16%            
Term Loan Due April 2020 [Member] | Group of Banks [Member]                          
Debt Instrument [Line Items]                          
Term loan                         $ 100,000,000
Senior Notes [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount $ 350,000,000   $ 350,000,000             $ 200,000,000      
Debt instrument, covenant compliance description             We were in compliance with all covenants at July 31, 2018.            
Outstanding balance             $ 156,700,000       $ 172,600,000    
Senior Notes [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period 2023-06                 2018-07      
Debt instrument, fixed interest rates 3.71%   3.71%             2.62%      
Senior Notes [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period 2030-06                 2025-07      
Debt instrument, fixed interest rates 4.17%   4.17%             3.13%      
Revolving Credit Agreement [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period           2020-02              
Debt instrument, covenant compliance description             We were in compliance with all covenants at July 31, 2018, and the amount we could borrow under the facility would not have been limited by any debt covenants.            
Repayments of outstanding balance under syndicated revolving credit facility     $ 315,000,000                    
Revolving credit facility $ 850,000,000   $ 850,000,000     $ 600,000,000              
Credit facility, term           5 years              
Outstanding balance             $ 0       249,138,000    
Revolving Credit Agreement [Member] | Swing Line Loans [Member]                          
Debt Instrument [Line Items]                          
Revolving credit facility           $ 50,000,000              
Syndicated Revolving Credit Agreement [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period           2016-12              
Three-year Note Purchase and Private Shelf Agreement [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount             $ 150,000,000            
Debt instrument, covenant compliance description             We were in compliance with all covenants at July 31, 2018, and the amount we could borrow would not have been limited by any debt covenants.            
period of agreements             3 years            
Maximum credit facility               $ 200,000,000 $ 180,000,000        
Maximum life of borrowings             12 years            
Maximum average life of borrowings             10 years            
Outstanding balance             $ 146,666,000       $ 146,666,000    
Three-year Note Purchase and Private Shelf Agreement [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period   2018-09                      
Three-year Note Purchase and Private Shelf Agreement [Member] | Minimum [Member] | Note A and B [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, fixed interest rates             2.21%            
Three-year Note Purchase and Private Shelf Agreement [Member] | Minimum [Member] | Note D 1 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, floating interest rates             3.47%            
Three-year Note Purchase and Private Shelf Agreement [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period   2026-09                      
Three-year Note Purchase and Private Shelf Agreement [Member] | Maximum [Member] | Note C [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, fixed interest rates             2.56%            
Three-year Note Purchase and Private Shelf Agreement [Member] | Maximum [Member] | Note D 2 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, floating interest rates             3.59%            
Senior Unsecured Notes [Member]                          
Debt Instrument [Line Items]                          
Term loan facility         $ 100,000,000                
Senior Unsecured Notes [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period         2019-07                
Debt instrument, fixed interest rates         2.89%                
Senior Unsecured Notes [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, maturity period         2027-07                
Debt instrument, fixed interest rates         3.19%