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Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
Other Liabilities and Deferred Revenue, Noncurrent			$ 125,800,000
Deferred Revenue, Additions	$ 300,700,000
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized	(291,300,000)
Cost of goods sold
Capitalized Contract Cost, Accumulated Amortization	(75,200,000)
Selling, General and Administrative Expenses [Member]
Capitalized Contract Cost, Accumulated Amortization	(17,500,000)
Other Current Assets [Member] \| cost to obtain a contract
Capitalized Contract Cost, Gross	6,700,000
Other Current Assets [Member] \| cost to fulfill a contract
Capitalized Contract Cost, Gross	26,900,000
Other Assets [Member] \| cost to obtain a contract
Capitalized Contract Cost, Gross	1,800,000
Other Assets [Member] \| cost to fulfill a contract
Capitalized Contract Cost, Gross	$ 3,400,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Computer Software, Intangible Asset [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Computer Software, Intangible Asset [Member] \| Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Rent Credit, Noncurrent		$ 3,300,000