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Debt - 2014 Credit Agreement (Details) $ in Millions, $ in Millions					12 Months Ended
	Jul. 30, 2020 USD ($)	May 01, 2020 USD ($)	Jul. 01, 2018	Mar. 13, 2018 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 13, 2018 CAD ($)	Mar. 13, 2018 AUD ($)	Mar. 31, 2017	Sep. 29, 2016 USD ($)	Oct. 17, 2014 USD ($)
Debt agreements
Consolidated leverage ratio					2.7
Proceeds from secured delayed draw term loan facility					$ 4,452,078,000	$ 7,700,774,000	$ 8,529,014,000
Term loan A
Debt agreements
Face amount											$ 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, basis spread (as a percent)		0.75%
2014 Credit Agreement
Debt agreements
Face amount											$ 500,000,000
Maximum borrowing capacity		$ 400,000,000
Consolidated leverage ratio				4.5	4.0			4.5	4.5	4.75		5.00
Consolidated interest coverage ratio					5.0
2014 Credit Agreement | Base Rate
Debt agreements
Interest rate, basis spread (as a percent)				0.75%
2014 Credit Agreement | Euro currency rate
Debt agreements
Interest rate, basis spread (as a percent)				1.75%
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
Face amount				$ 510,000,000				$ 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
Face amount				$ 600,000,000
2014 Credit Agreement | Revolving credit facility
Debt agreements
Maximum borrowing capacity				$ 1,350,000,000								$ 1,050,000,000.00
Current borrowing capacity						1,331,000,000.0	$ 1,327,200,000
Outstanding letters of credit					$ 19,000,000.0	$ 22,800,000

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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
-Name Accounting Standards Codification
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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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