Fair Value Measurements (Details 5) (USD $)	3 Months Ended	9 Months Ended
	Sep. 28, 2013	Sep. 28, 2013	Sep. 29, 2012
Quantitative information for Level 3 Fair Value Measurements Liabilities
Adjustments to contingent consideration	$ 3,600,000	$ 300,000	$ 0
Impairment charge related to property, plant, and equipment		1,961,000
Multiple outcome discounted cash flow | Levitronix Medical
Quantitative information for Level 3 Fair Value Measurements Liabilities
Fair value Liabilities	21,479,000	21,479,000
Multiple outcome discounted cash flow | DuraHeart II Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Fair value Liabilities	19,066,000	19,066,000
Multiple outcome discounted cash flow | Minimum | Levitronix Medical
Quantitative information for Level 3 Fair Value Measurements Liabilities
Annual Revenue	29,600,000	29,600,000
Discount rate (as a percent)		0.80%
Probability of occurrence (as a percent)		10.00%
Multiple outcome discounted cash flow | Minimum | DuraHeart II Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Discount rate (as a percent)		5.30%
Probability of occurrence (as a percent)		1.00%
Multiple outcome discounted cash flow | Maximum | Levitronix Medical
Quantitative information for Level 3 Fair Value Measurements Liabilities
Annual Revenue	48,200,000	48,200,000
Discount rate (as a percent)		1.39%
Probability of occurrence (as a percent)		50.00%
Multiple outcome discounted cash flow | Maximum | DuraHeart II Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Discount rate (as a percent)		20.00%
Probability of occurrence (as a percent)		50.00%
Multiple outcome discounted cash flow | Weighted Average | Levitronix Medical
Quantitative information for Level 3 Fair Value Measurements Liabilities
Annual Revenue	$ 42,300,000	$ 42,300,000
Discount rate (as a percent)		1.04%
Probability of occurrence (as a percent)		20.00%