Business Segments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 01, 2012 Product Segment	Jan. 02, 2011	Jan. 03, 2010
Revenue, Major Customer [Line Items]
Sales from U.S.	$ 1,623.0	$ 1,551.2	$ 1,561.6
Business Segments (Additional Textual) [Abstract]
Number of Product Line	2
Sales to International Customers	689.9	470.8	427.7
Sales by Operations	424.8	397.7	394.6
Maximum Sale Outside United States	10.00%
Number of reportable segments	4
Department of Defense [Member]
Revenue, Major Customer [Line Items]
Sales from U.S.	$ 560.6	$ 555.0	$ 590.5

Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration