Goodwill and Acquired Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Changes in the carrying amount of goodwill
Goodwill resulting from the acquisition during the period	$ 32,250	$ 156,103
Additions due to contingent consideration	1,347	2,790
Effect of foreign currency translation	(365)
Goodwill	192,125	158,893	0
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	264,776	283,856
Accumulated amortization	91,542	105,158
Total acquired intangibles	173,234	178,698
Existing Technology And Backlog [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	90,433	91,800
Accumulated amortization	17,119	27,350
Total acquired intangibles	73,314	64,450
Agreements and relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	118,060	135,773
Accumulated amortization	27,123	36,579
Total acquired intangibles	90,937	99,194
Distribution rights [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	30,100	30,100
Accumulated amortization	25,585	22,575
Total acquired intangibles	4,515	7,525
Tradenames Trademarks And Patents [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	26,183	26,183
Accumulated amortization	21,715	18,654
Total acquired intangibles	$ 4,468	$ 7,529