Inventories (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2014	Dec. 28, 2013
Inventories [Abstract]
Stores and spare parts inventory	$ 16.0	$ 15.9

Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-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 210.5-02.6)

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

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