Insurance Reserves (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014
Insurance Reserves
Total amount committed under letters of credit	$ 21.2

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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