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Credit Facilities and Debt 5.625% Senior Notes due 2026 (Details) - 5.625% Senior Notes due 2026 [Member] - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 22, 2016
Debt Instrument [Line Items]      
Senior Notes, Noncurrent $ 495,518 $ 494,915 $ 500,000
Proceeds from issuance of senior notes $ 495,000    
Change of Control [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 101.00%    
At any time and from time to time before December 15, 2021 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 105.625%    
Asset Sale [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 100.00%    
Before December 15, 2021 [Member]      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption Price, Percentage 100.00%    
Aggregate Principal Amount of Senior Notes, Redemption of Principal Amount, Percentage 35.00%    
Before December 15, 2021 [Member] | Minimum      
Debt Instrument [Line Items]      
Aggregate Principal Amount of Senior Notes, Redemption of Principal Amount, Percentage 50.00%