Goodwill and Acquired Intangibles (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Amortization of acquired intangibles
Cost of product	$ 10,480,000	$ 5,603,000	$ 4,341,000
Cost of maintenance	0	1,045,000	4,180,000
Amortization of acquired intangibles	16,536,000	14,160,000	11,420,000
Total acquired intangibles	27,016,000	20,808,000	19,941,000
Estimated amortization expense
2012	26,653,000
2013	23,111,000
2014	20,303,000
2015	19,989,000
2016	19,550,000
Thereafter	63,628,000
Total estimated amortization expense	173,234,000
Goodwill and Acquired Intangibles (Textual) [Abstract]
Intangible assets allocated to in-process research and development		$ 500,000