Employee Benefit Plans: (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 01, 2013 investmentoption item	Jan. 03, 2012
Employee Benefit Plans:
Number of restaurant concepts for which section 401(k) is open to participation by staff members	3
Minimum number of investment options available to participating plan members	1
Maximum amount of eligible bonuses that may be deferred by participating staff members under the ESP (as a percent)	100.00%
Accrued liability for self-insured medical benefit plan	$ 4.9	$ 5.3

Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).

No definition available.

Name:	us-gaap_SelfInsuranceReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant