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Debt - Partial Redemption of 4.125% Senior Secured Notes (Details) € in Thousands, $ in Millions			3 Months Ended		9 Months Ended
	Jun. 30, 2020 EUR (€)	Oct. 12, 2018 EUR (€)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Apr. 30, 2019	Oct. 09, 2018
Debt Instrument [Line Items]
Loss on extinguishment of debt | $			$ 0	$ 4	$ 0	$ 7
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate	4.125%		4.125%	4.125%	4.125%	4.125%
4.125% Senior Secured Notes due 2024 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	4.125%	4.125%	4.125%		4.125%			4.125%
Redemptions of senior notes	€ 311,000	€ 34,500
Senior notes redemption price		€ 36,170
Redemption price, percentage of principal amount redeemed		103.00%
Debt instrument remaining outstanding amount		€ 311,000
Loss on extinguishment of debt | $						$ 2
3.625% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Interest rate	3.625%		3.625%	3.625%	3.625%	3.625%
3.625% Senior Secured Notes due 2026 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	3.625%		3.625%		3.625%		3.625%	3.625%

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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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