Goodwill and Acquired Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012		Dec. 31, 2011
Changes in the carrying amount of goodwill
Balance at beginning of period	$ 192,125		$ 158,893
Effect of foreign currency translation	420		(365)
Balance at end of period	233,266		192,125
Goodwill resulting from acquisitions [Member]
Changes in the carrying amount of goodwill
Goodwill, Acquired During Period	39,680		32,250
Additions due to contingent consideration [Member]
Changes in the carrying amount of goodwill
Goodwill, Acquired During Period	$ 1,041	[1]	$ 1,347	[1]

[1] Cadence accounts for business combinations with acquisition dates on or before January 3, 2009 under the purchase method in accordance with accounting standards that were authoritative at that time, whereby contingent consideration is added to goodwill as it is earned.