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.

No definition available.

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

Noncontrolling Interests - Joint Ventures (Details)	Dec. 31, 2017 restaurant item	Dec. 25, 2016 restaurant	Dec. 27, 2015 restaurant
Minority Interest [Line Items]
Number of joint ventures \| item	5
Joint ventures
Minority Interest [Line Items]
Number of Restaurants \| restaurant	246	222	213