Product Warranty (Schedule Of Extended Product Warranty) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Product Warranty
Balance at beginning of period	$ 9,870	$ 4,470	$ 8,972	$ 4,055
Deferral of new extended warranty revenue	1,861	1,581	3,798	3,215
Recognition of extended warranty deferred revenue	(1,423)	(408)	(2,462)	(1,627)
Balance at end of period	$ 10,308	$ 5,643	$ 10,308	$ 5,643

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the extended product warranty. Does not include any Increase or Decrease in the liability for payments related to standard product warranties.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 45
-Paragraph 14
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Name:	us-gaap_ExtendedProductWarrantyAccrualPayments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration