Business Segment Information (Total Net Revenues By Geographic Region) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Segment Reporting Information [Line Items]
Total net revenues	$ 371,891	$ 345,041	$ 1,117,181	$ 1,047,005
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	195,763	193,631	587,983	575,090
Europe, Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Total net revenues	132,522	116,649	406,458	368,562
Asia, Latin America, Canada And Mexico [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 43,606	$ 34,761	$ 122,740	$ 103,353

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration