Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011
Length of fiscal period (in weeks)	P52W	P52W	P52W
Period for product warranty	1 year
Selling, general and administrative expenses include company-funded research and development	$ 131.6	$ 101.9	$ 61.3
Costs related to customer-funded research and development contracts	232.6	213.8	258.6
Stock options excluded in computation of diluted (in shares)	513,340	388,660	846,307
Stock options to purchase common stock	2,000,000	2,300,000	2,100,000
Contingent shares under compensation plan	0	4,996	22,668
Reserve for doubtful accounts	4.7	3.8
Expense of reserve for doubtful accounts	1.4	0.7	1.4
Maximum maturity of money market mutual funds and bank deposits	3 months
Cash equivalents	2.4	0.3
Depreciation expense on property, plant and equipment, including assets under capital leases	48.9	39.6	30.6
Cash payments for federal, foreign and state income taxes	15.0	21.9	59.9
Income taxes paid on gain on sale of discontinued operations		51.3
Tax refunds received totaled	1.9	11.1	15.5
Cash payments for interest and credit facility fees totaled	$ 16.2	$ 15.7	$ 2.8
Minimum [Member] | Equipment [Member]
Property, plant and equipment, useful life	5 years
Minimum [Member] | Computer Hardware and Software [Member]
Property, plant and equipment, useful life	3 years
Maximum [Member] | Building [Member]
Property, plant and equipment, useful life	45 years
Maximum [Member] | Equipment [Member]
Property, plant and equipment, useful life	18 years
Maximum [Member] | Computer Hardware and Software [Member]
Property, plant and equipment, useful life	5 years