Basis of Presentation - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 27, 2021	Sep. 26, 2020	Mar. 28, 2020	Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 39,869	$ 652,712	$ 331,555
Restricted cash	12,612	13,685	13,021
Total cash, cash equivalents and restricted cash	$ 52,481	$ 666,397	$ 344,576	$ 510,701

Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant