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Debt-Textuals (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 17, 2020
Jun. 30, 2020
Apr. 30, 2020
Aug. 23, 2020
Aug. 25, 2019
Aug. 23, 2020
Aug. 25, 2019
Debt Instruments [Line Items]              
Weighted-average interest rate       4.78% 5.30% 4.65% 5.28%
Senior Notes | 5.00% Senior Notes, Due 2025              
Debt Instruments [Line Items]              
Aggregate principal amount $ 500,000,000   $ 500,000,000        
Stated interest rate       5.00%   5.00%  
Offering price 100.50%            
Net proceeds $ 496,000,000            
Senior revolving credit facility              
Debt Instruments [Line Items]              
Unused availability       $ 608,000,000.0   $ 608,000,000.0  
Total availability       638,500,000   638,500,000  
Letters of credit and other credit usage       $ 30,500,000   $ 30,500,000  
Proceeds from senior revolving credit facility     $ 300,000,000        
Repayments of senior revolving credit facility   $ 300,000,000