Contingencies (Details Textual) (USD $) In Millions	9 Months Ended
	Oct. 01, 2011	Feb. 11, 2011	Feb. 08, 2011
Contingencies [Abstract]
Agreed consideration for securities litigation settlement		$ 38.0
Payment to securities litigation settlement fund	16.4
Company portion of the securities litigation settlement consideration	15.8
Company portion of accrued interest for securities litigation settlement	0.6
Consideration for securities litigation settlement paid by Company's insurers	22.2
Consideration for proposed securities litigation settlement to be paid by Cadence's insurers		22.2
Plaintiff's attorneys fees to be paid by Cadence's insurers as part of derivative settlement			$ 1.8
Warranty on sale of hardware products to customers	generally for a 90-day period