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Contingencies (Details) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
Contingencies (Details) In Thousands, except Per Share data	Jul. 02, 2011 USD ($)	Jul. 03, 2010 USD ($)	Jul. 02, 2011 USD ($)	Jul. 03, 2010 USD ($)	Jul. 02, 2011 Pending or Threatened Litigation [Member] USD ($)	Jul. 02, 2011 Tekelec Matter [Member] EUR (€)	Jul. 02, 2011 E ON AG [Member] USD ($)	Jul. 02, 2011 Groundwater Removal [Member] Huntsville Site [Member] USD ($)	Jul. 02, 2011 Groundwater Removal [Member] Norco Site [Member] USD ($)	Jul. 02, 2011 Project Management [Member] Norco Site [Member] USD ($)	Jul. 02, 2011 Investigation Report [Member] Norco Site [Member] USD ($)	Jul. 02, 2011 Huntsville Site [Member] USD ($)	Jul. 02, 2011 Norco Site [Member] USD ($)
Site Contingency [Line Items]
Settlement of legal matter	$ 0	$ 0	$ 5,875	$ 0	$ 5,875
Settlement of legal matter			3,609	0	3,609
Loss Related to Litigation Settlement Per Share					$ 0.03
Loss Contingency, Range of Possible Loss, Maximum						11,333
Loss Contingency Damages Sought Value						3,742							16,000
Loss Contingency, Expenses Sought, Value						312
Site Contingency, Loss Exposure Not Accrued, Low Estimate												2,500
Site Contingency, Loss Exposure Not Accrued, High Estimate												4,000
Environmental Remediation Expense To Date								3,000	10,000	30,000
Additional Expected Project Expenditures Low Estimate								500	12,700	400	400
Additional Expected Project Expenditures High Estimate								1,000	24,500	500	700
Future Costs Expected to Be Covered by Indeminifcations			450
Loss Contingency, Related Receivable Carrying Value	47,327		47,327
Loss Contingency, Related Receivable Carrying Value, Period Increase (Decrease)			3,124
Environmental Cost Recognized, Recovery Credited to Expense	13,000		13,000
Claim For Reimbursement of Pre Acquisition Tax Liabilities							8,729
Pre Acquisition Tax Liabilities Acknowledged by Acquiree							6,335
Business Combination, Tax Receivable Assumed, Expected to be Recovered							$ 4,495