Deferred Revenue And Customer Advances (Schedule Of Deferred Revenue And Customer Advances) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Deferred Revenue And Customer Advances
Customer advances	$ 105,696	$ 132,559
Maintenance, training and extended warranty	34,739	36,626
Undelivered elements	7,401	5,858
Acceptance	951	2,083
Total deferred revenue and customer advances	$ 148,787	$ 177,126

Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15a)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_CustomerAdvancesAndDeposits
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant