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Fair value measurement - Valuation technique and inputs used to determine fair value (Details)	6 Months Ended
	Jun. 26, 2016
Probability Of Payment | Weighted Average
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]
Contingent consideration	71.30%
Probability Of Payment | Minimum
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]
Contingent consideration	2.00%
Probability Of Payment | Maximum
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]
Contingent consideration	100.00%
Market Approach Valuation Technique | Weighted Average
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]
Contingent consideration	8.40%
Market Approach Valuation Technique | Minimum
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]
Contingent consideration	2.60%
Market Approach Valuation Technique | Maximum
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]
Contingent consideration	10.00%

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Fair value assets and liabilities measured on unobservable inputs.

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Valuation techniques significant unobservable inputs discount.

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