Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 03, 2010	Jan. 01, 2012	Jan. 02, 2011	Jan. 03, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]
Selling, general and administrative expenses include company-funded research and development		$ 101.9	$ 61.3	$ 58.8
Costs related to customer-funded research and development contracts		213.8	258.6	316.0
Stock options excluded computation of diluted earnings per share		388,660	846,307	910,539
Stock options to purchase common stock		2,300,000	2,100,000	1,800,000
Contingent shares under compensation plan		4,996	22,668	14,135
Cash equivalents		0.3	61.8
Maximum maturity of money market mutual funds and bank deposits		3 months
Reserve for doubtful accounts		3.8	2.9
Expense of reserve for doubtful accounts		0.7	1.4	0.4
Property, Plant and Equipment depreciated over periods		Buildings are depreciated over periods not exceeding 45 years, equipment over 5 to 18 years, computer hardware and software over 3 to 5 years and leasehold improvements over the shorter of the estimated remaining lives or lease terms
Depreciation expense on property, plant and equipment, including assets under capital leases		39.6	30.6	30.1
Expected reclassification of loss over the next 12 months		2.3
Cash flow hedges for total payment	0.6
Unamortized loss		0.5
Cash Payments for Federal Foreign and State Income Taxes		21.9	59.9	28.1
Tax refunds received totaled		11.1	15.5	32.9
Cash payments for interest and credit facility fees totaled		15.7	2.8	6.5
Amount of Income Tax on gain on sale of discontinued operation		51.3
Comprehensive income/loss		199.7	106.8	147.8
Net of deferred taxes		129.8	105.5	99.0
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum		45
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum		18
Property, Plant and Equipment, Useful Life, Minimum		5
Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum		5
Property, Plant and Equipment, Useful Life, Minimum		3
Designated as Hedging Instrument [Member]
Property, Plant and Equipment [Line Items]
Amount of foreign currency contract designated as cash flow hedges		60.7
Fair value of foreign currency contract designated as cash flow hedges		2.0
Not Designated as Hedging Instrument [Member]
Property, Plant and Equipment [Line Items]
Amount of foreign currency contract		16.5
Fair value of foreign currency contract		0.5
Effect of derivative instruments not designated as cash flow hedges recognized in other income and expense		$ 0.7