Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Reserve for inventory	Inventory in excess of 12 month demand
Capitalized cost of software developed for internal use	$ 4.0	$ 5.2	$ 10.5
Depreciation and amortization expense for property, plant and equipment	55.3	61.7	69.4
Amount of abandoned and impaired long lived assets		0.5	6.7
Period for revenue recognition for perpetual licenses maintenance	12 months
Maximum period for collection of receivables	5 years
Maximum percentage of finance fee revenue as percentage of total revenue	1.00%	1.00%	2.00%
Time period between shipment of the first hardware product and the last hardware product	One to four quarters
Revenue under the pre-existing accounting standards	15.4
Percentage of likelihood of tax benefit being realized upon effective settlement of audit	50.00%
Advertising Expense	7.5	8.6	6.7
Accumulated Deficit
Summary of Significant Accounting Policies (Textual) [Abstract]
Loss on Re-issuance of treasury stock	$ 16.6	$ 87.4	$ 213.4
Convertible Senior Notes Due December 2013 [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Stated interest rate of Convertible Senior Notes	1.50%
Convertible Senior Notes Due 2015 [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Stated interest rate of Convertible Senior Notes	2.625%
Forward Contracts [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Maturity period of forward contracts	90 days
Acquired Intangible Assets [Member]
Finite Lived Intangible Assets (Textual) [Abstract]
General Term Of Software Arrangement - Minimum	1
General Term Of Software Arrangement - Maximum	12
Software Products [Member]
Finite Lived Intangible Assets (Textual) [Abstract]
General Term Of Software Arrangement - Minimum	2
General Term Of Software Arrangement - Maximum	4