Subsequent Event	12 Months Ended
Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Events In October 2017, we issued and sold $400.0 million aggregate principal amount of 5.875% unsecured Senior Notes due October 2027 at par (before underwriting and other issuance costs) through a private placement to qualified institutional buyers (the 2027 Notes). Interest on the 2027 Notes is payable semi-annually, beginning on April 15, 2018. The 2027 Notes will mature on October 15, 2027. We may redeem the 2027 Notes at any time prior to October 15, 2022, in whole or in part, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, together with accrued and unpaid interest to, but excluding, the redemption date, plus a customary make-whole premium. In addition, on or prior to October 15, 2022, we may redeem up to 35% of the aggregate principal amount of the 2027 Notes with the net cash proceeds of certain equity offerings at a redemption price equal to 105.875% of the principal amount, plus accrued and unpaid interest to, but excluding, the redemption date, provided at least 65% of the aggregate principal amount of the 2027 Notes originally issued remains outstanding immediately after such redemption. The covenants related to the 2027 Notes are consistent with our other senior notes. The proceeds of the 2027 Notes, as well as $34.5 million cash on hand, were used to redeem $225.0 million of our 5.75% unsecured Senior Notes due 2019 and $175.0 million of our 7.25% unsecured Senior Notes due 2023, resulting in a loss on extinguishment of debt of $25.9 million, of which $3.2 million was a non-cash write-off of debt issuance and discount costs. In October, 2017, we executed a Fourth Amendment to the Facility. The Fourth Amendment (1) extends the termination date of the Facility from February 15, 2019 to February 15, 2020; (2) increases the maximum aggregate amount of commitments under the Facility (including borrowings and letters of credit) from $180.0 million to $200.0 million; and (3) includes a condition that allows the facility to be increased by an additional $50 million to $250 million at the discretion of the lenders.

Subsequent Events

In October 2017, we issued and sold $400.0 million aggregate principal amount of 5.875% unsecured Senior Notes due October 2027 at par (before underwriting and other issuance costs) through a private placement to qualified institutional buyers (the 2027 Notes). Interest on the 2027 Notes is payable semi-annually, beginning on April 15, 2018. The 2027 Notes will mature on October 15, 2027. We may redeem the 2027 Notes at any time prior to October 15, 2022, in whole or in part, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, together with accrued and unpaid interest to, but excluding, the redemption date, plus a customary make-whole premium. In addition, on or prior to October 15, 2022, we may redeem up to 35% of the aggregate principal amount of the 2027 Notes with the net cash proceeds of certain equity offerings at a redemption price equal to 105.875% of the principal amount, plus accrued and unpaid interest to, but excluding, the redemption date, provided at least 65% of the aggregate principal amount of the 2027 Notes originally issued remains outstanding immediately after such redemption. The covenants related to the 2027 Notes are consistent with our other senior notes.

The proceeds of the 2027 Notes, as well as $34.5 million cash on hand, were used to redeem $225.0 million of our 5.75% unsecured Senior Notes due 2019 and $175.0 million of our 7.25% unsecured Senior Notes due 2023, resulting in a loss on extinguishment of debt of $25.9 million, of which $3.2 million was a non-cash write-off of debt issuance and discount costs.

In October, 2017, we executed a Fourth Amendment to the Facility. The Fourth Amendment (1) extends the termination date of the Facility from February 15, 2019 to February 15, 2020; (2) increases the maximum aggregate amount of commitments under the Facility (including borrowings and letters of credit) from $180.0 million to $200.0 million; and (3) includes a condition that allows the facility to be increased by an additional $50 million to $250 million at the discretion of the lenders.