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Indebtedness (Narrative) (Details)		12 Months Ended
	Jul. 08, 2019 USD ($) extnsion_option	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)	Oct. 01, 2017 USD ($)	May 01, 2019 USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 2,757,000	$ 0	$ 0
Securitization Transaction
Debt Instrument [Line Items]
Deferred financing costs	$ 33,000,000.0
Fifth Amendment
Debt Instrument [Line Items]
Deferred financing costs					$ 1,300,000
Senior Notes | Class A-2-I Notes
Debt Instrument [Line Items]
Proceeds from issuance of secured debt	$ 575,000,000.0
Interest rate	3.982%
Effective interest rate		4.541%
Senior Notes | Class A-2-II Notes
Debt Instrument [Line Items]
Proceeds from issuance of secured debt	$ 275,000,000.0
Interest rate	4.476%
Effective interest rate		4.798%
Senior Notes | Class A-2-III Notes
Debt Instrument [Line Items]
Proceeds from issuance of secured debt	$ 450,000,000.0
Interest rate	4.97%
Effective interest rate		5.196%
Senior Notes | Class A-2 Notes
Debt Instrument [Line Items]
Principal amount	$ 150,000,000.0
Principal payments due if specified leverage ratio achieved	$ 0	$ 0
Specified maximum leverage ratio	5.0	5.0
Number of extensions for variable funding notes | extnsion_option	2
Length of extension period	1 year
Interest rate after repayment date	5.00%
Letters of credit outstanding, amount		$ 45,600,000
Senior Notes | Maximum | Class A-2 Notes
Debt Instrument [Line Items]
Scaled commitment fee (percent)	1000.00%
Senior Notes | Minimum | Class A-2 Notes
Debt Instrument [Line Items]
Scaled commitment fee (percent)	500.00%
Master Issuer
Debt Instrument [Line Items]
Restricted cash		26,000,000.0
Interest expense, net
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 2,800,000

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