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Long-Term Borrowings - Schedule of percentage of redemption price borrowings (Details) | 12 Months Ended
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Sep. 30, 2017
5.5% Senior Notes due June 1, 2024 [Member] | 2019 |
Senior Notes [Abstract] |
Redemption prices percentage | 102.75%
5.5% Senior Notes due June 1, 2024 [Member] | 2020 |
Senior Notes [Abstract] |
Redemption prices percentage | 101.833%
5.5% Senior Notes due June 1, 2024 [Member] | 2021 |
Senior Notes [Abstract] |
Redemption prices percentage | 100.917%
5.5% Senior Notes due June 1, 2024 [Member] | 2022 and thereafter |
Senior Notes [Abstract] |
Redemption prices percentage | 100.00%
5.75% Senior Notes due March 1, 2025 [Member] | 2020 |
Senior Notes [Abstract] |
Redemption prices percentage | 102.875%
5.75% Senior Notes due March 1, 2025 [Member] | 2021 |
Senior Notes [Abstract] |
Redemption prices percentage | 101.917%
5.75% Senior Notes due March 1, 2025 [Member] | 2022 |
Senior Notes [Abstract] |
Redemption prices percentage | 100.958%
5.75% Senior Notes due March 1, 2025 [Member] | 2023 and thereafter |
Senior Notes [Abstract] |
Redemption prices percentage | 100.00%
5.875% Senior Notes due March 1, 2027 [Member] | 2022 |
Senior Notes [Abstract] |
Redemption prices percentage | 102.938%
5.875% Senior Notes due March 1, 2027 [Member] | 2023 |
Senior Notes [Abstract] |
Redemption prices percentage | 101.958%
5.875% Senior Notes due March 1, 2027 [Member] | 2024 |
Senior Notes [Abstract] |
Redemption prices percentage | 100.979%
5.875% Senior Notes due March 1, 2027 [Member] | 2025 and thereafter |
Senior Notes [Abstract] |
Redemption prices percentage | 100.00%

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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