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.

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

Basis of Presentation and Our Divisions (Schedule of Quarterly Reporting) (Details)	3 Months Ended			4 Months Ended
	Sep. 09, 2017	Jun. 17, 2017	Mar. 25, 2017	Dec. 30, 2017	Dec. 31, 2016
U.S. and Canada
Segment Reporting Information [Line Items]
Quarterly reporting calendar, period	P12W	P12W	P12W	P16W	P17W
International Divisions
Segment Reporting Information [Line Items]
Quarterly reporting calendar, period	June, July and August	March, April and May	January, February	September, October, November and December