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Long-term Debt (Revolving Credit Facility) (Narrative) (Details)
9 Months Ended
Jun. 30, 2017
USD ($)
tranche
Line of Credit Facility [Line Items]  
Total issued letters of credit $ 38,300,000
Number of tranches in revolving credit facility (in tranches) | tranche 2
Minimum  
Line of Credit Facility [Line Items]  
Facility fee percentage 0.10%
Maximum  
Line of Credit Facility [Line Items]  
Facility fee percentage 0.25%
Letter of Credit  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity $ 300,000,000
Eurocurrency Interest Rate | Minimum  
Line of Credit Facility [Line Items]  
Margin added to variable rate interest rate (percentage) 1.00%
Eurocurrency Interest Rate | Maximum  
Line of Credit Facility [Line Items]  
Margin added to variable rate interest rate (percentage) 1.50%
Base Interest Rate | Minimum  
Line of Credit Facility [Line Items]  
Margin added to variable rate interest rate (percentage) 0.00%
Base Interest Rate | Maximum  
Line of Credit Facility [Line Items]  
Margin added to variable rate interest rate (percentage) 0.50%
Sub Facility Of Swing Line Loans  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity $ 50,000,000
2014 Facility  
Line of Credit Facility [Line Items]  
Available borrowing capacity 1,300,000,000
2014 Facility | Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Credit facility, maximum borrowing capacity 1,600,000,000
Credit facility, potential borrowing capacity 2,100,000,000
Direct borrowings on credit facility 282,000,000
2014 Facility | Letter of Credit  
Line of Credit Facility [Line Items]  
Direct borrowings on credit facility 2,500,000
Committed And Uncommitted Letter Of Credit Facility | Letter of Credit  
Line of Credit Facility [Line Items]  
Direct borrowings on credit facility $ 35,800,000