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Debt and Credit Facilities 5.375% Senior Notes due 2020 (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Dec. 22, 2016
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,666,500   $ 2,137,000  
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security 513,642 $ 300,000    
Loss on extinguishment of debt $ 18,656 $ 910    
5.375% Senior Notes due August 15, 2020        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage       5.375%