The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_RestrictedCashAndInvestmentsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			0 Months Ended	9 Months Ended
	Feb. 28, 2014	Sep. 28, 2014	Dec. 29, 2013	Sep. 13, 2013 Threatened Litigation [Member]	Sep. 29, 2013 Threatened Litigation [Member]
Loss Contingencies [Line Items]
Demand for payment				$ 26.0
Decline in contributions, percent (more than)					70.00%
Restricted cash		$ 29.2	$ 28.1
Threshold of employee terminations triggering Section 4062(e) of the Employee Retirement Income Security Act of 1974, percent	20.00%