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Debt - Tender Offer and Redemption of 5.000% Senior Secured Notes (Details) $ in Thousands, € in Millions					12 Months Ended
	Aug. 16, 2021 USD ($)	Apr. 15, 2021 USD ($)	Aug. 01, 2020	Jul. 14, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2021 EUR (€)	Jun. 30, 2021 USD ($)	Jan. 20, 2021	Jun. 30, 2020	Jun. 29, 2020 USD ($)	Jun. 29, 2020 EUR (€)	Jun. 16, 2020
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 10,000	$ 12,000			$ 22,000	$ 34,000	$ 7,000
5.000% Senior Secured Notes due 2023 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate				5.00%					5.00%			5.00%	5.00%	5.00%
Face or principal amount of debt instrument									$ 244,000			$ 244,000
Debt instrument remaining outstanding amount									$ 300,000
Redemptions of senior notes				$ 295,000
Redemption price, percentage of principal amount redeemed			101.25%
Loss on extinguishment of debt						$ 6,000
3.875% Senior Secured Notes due 2030 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate								3.875%		3.875%	3.875%	3.875%	3.875%
Face or principal amount of debt instrument												$ 535,000
2.750% Senior Secured Notes due 2028 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate								2.75%		2.75%	2.75%	2.75%	2.75%
Face or principal amount of debt instrument | €								€ 325					€ 325

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