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Debt - 2014 Credit Agreement (Details) $ in Millions, $ in Millions								9 Months Ended
	Apr. 13, 2021 USD ($)	Feb. 08, 2021 USD ($)	Jul. 30, 2020 USD ($)	May 01, 2020 USD ($)	Jul. 01, 2018	Mar. 13, 2018 USD ($)	Oct. 17, 2014 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 25, 2021 USD ($)	Apr. 26, 2021 USD ($)	Sep. 30, 2020 USD ($)	Oct. 01, 2019	Mar. 13, 2018 CAD ($)	Mar. 13, 2018 AUD ($)	Mar. 31, 2017	Sep. 29, 2016 USD ($)	Oct. 17, 2014 CAD ($)	Oct. 17, 2014 AUD ($)	Oct. 06, 2014
Debt agreements
Proceeds from secured delayed draw term loan facility								$ 2,848,244,000	$ 4,203,556,000
Term loan A
Debt agreements
Maximum borrowing capacity																	$ 185,000,000.0
Revolving credit facility
Debt agreements
Proceeds from secured delayed draw term loan facility			$ 248,500,000
Revolving credit facility | Euro currency rate
Debt agreements
Interest rate				0.75%
2014 Credit Agreement
Debt agreements
Maximum borrowing capacity				$ 400,000,000
Maximum leverage ratio				4.00
Subject to increase leverage ratio				4.50
Consolidated leverage ratio	4.00							2.5
Consolidated interest coverage ratio	3.00							6.8
2014 Credit Agreement | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)		0.50%
2014 Credit Agreement | LIBOR
Debt agreements
Interest rate, basis spread (as a percent)		1.50%
2014 Credit Agreement | Minimum | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)					0.25%
2014 Credit Agreement | Minimum | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)					1.25%
2014 Credit Agreement | Maximum | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)					1.00%
2014 Credit Agreement | Maximum | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)					2.00%
2014 Credit Agreement | Term loan A
Debt agreements
Maximum borrowing capacity						$ 510,000,000	$ 510,000,000			$ 215,000,000				$ 500	$ 250			$ 500	$ 250
2014 Credit Agreement | Term loan A | Base Rate | USD
Debt agreements
Interest rate, basis spread (as a percent)						0.50%
2014 Credit Agreement | Term loan A | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)						1.50%
2014 Credit Agreement | Term loan B
Debt agreements
Maximum borrowing capacity						$ 600,000,000	600,000,000
2014 Credit Agreement | Term loan B | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)						0.75%
2014 Credit Agreement | Term loan B | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)						1.75%
2014 Credit Agreement | Term B facility
Debt agreements
Maximum borrowing capacity	$ 700,000,000
2014 Credit Agreement | Term B facility | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)	0.75%
2014 Credit Agreement | Term B facility | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)	1.75%
2014 Credit Agreement | Revolving credit facility
Debt agreements
Maximum borrowing capacity		$ 1,150,000,000
Current borrowing capacity								$ 1,138,800,000				$ 1,331,000,000.0
Increase in borrowing capacity						$ 1,350,000,000	$ 1,050,000,000.00
Outstanding letters of credit								$ 11,200,000				$ 19,000,000.0
2014 Credit Agreement | Revolving credit facility | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)						0.75%
2014 Credit Agreement | Revolving credit facility | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)						1.75%
2014 Credit Agreement | Line of credit
Debt agreements
Maximum borrowing capacity																	$ 500,000,000
Consolidated leverage ratio						4.5							4.0	4.5	4.5	4.75	5.00
2024 Senior Notes
Debt agreements
Cash tender	$ 700,000,000										$ 697,200,000
Interest rate (as a percent)	5.875%									5.875%										5.875%

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Last day of any period, the ratio of Consolidated total debt on such day to the consolidated EBITDA for such period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Face (par) amount of the original debt instrument that was repurchased.

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Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of increase (decrease) of the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Indebtedness divided by net capital.

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