Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 29, 2019	Dec. 30, 2018
Cash and cash equivalents [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, amounts in transit from credit card companies	$ 44.8	$ 47.1

Amount due the Entity as a result of customers utilizing point of sale debit or credit cards in exchange transactions with the entity which are 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. Generally, only investments with original maturities of three months or less qualify under that definition.

No definition available.

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