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Debt - Redemption of 5.625% Senior Secured Notes (Details) - USD ($) $ in Thousands			12 Months Ended
	Nov. 05, 2018	Oct. 09, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Apr. 30, 2019
Debt Instrument [Line Items]
Redemptions of senior notes			$ 0	$ 0	$ 635,000
Gain (loss) on extinguishment of debt			$ (34,000)	$ (7,000)	$ (31,000)
5.625% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate			5.625%	5.625%	5.625%
5.625% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	5.625%	5.625%				5.625%
Redemptions of senior notes	$ 26,550	$ 26,550
Senior notes redemption price	$ 27,380
Redemption price, percentage of principal amount redeemed	102.813%
Debt instrument remaining outstanding amount	$ 220,950
Gain (loss) on extinguishment of debt	$ (1,000)			$ (4,000)

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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