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Borrowings - Debt Redemption (Details) - Senior Notes
9 Months Ended
Jun. 30, 2020
6 3/4% Senior Notes Maturing March of 2025  
Debt Instrument [Line Items]  
Stated interest rate on debt instrument (percent) 6.75%
Percentage of principal amount redeemed 35.00%
Redemption price (as a percentage) 106.75%
Percentage of principal amount outstanding after redemption 65.00%
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period One  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.00%
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Two  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 105.063%
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Three  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 103.375%
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Four  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 101.688%
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Five  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.00%
5 7/8% Senior Notes Maturing October 2027  
Debt Instrument [Line Items]  
Stated interest rate on debt instrument (percent) 5.88%
Percentage of principal amount redeemed 35.00%
Redemption price (as a percentage) 105.875%
Percentage of principal amount outstanding after redemption 65.00%
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period One  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.00%
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Two  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 102.938%
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Three  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 101.958%
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Four  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.979%
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Five  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.00%
7 1/4% Senior Notes Maturing October 2029  
Debt Instrument [Line Items]  
Stated interest rate on debt instrument (percent) 7.25%
Percentage of principal amount redeemed 35.00%
Redemption price (as a percentage) 107.25%
Percentage of principal amount outstanding after redemption 65.00%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period One  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.00%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Two  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 103.625%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Three  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 102.417%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Four  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 101.208%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Five  
Debt Instrument [Line Items]  
Redemption price (as a percentage) 100.00%