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Summary of Significant Accounting Policies - (Advertising Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Franchisor Disclosure [Line Items]
Advertising expense	$ 3.9	$ 11.2	$ 15.0
Franchise and license revenue
Franchisor Disclosure [Line Items]
Advertising expense	$ 53.7	$ 81.1	$ 78.3

X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FranchisorDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_FranchiseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: