Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Fixed interest rate related to the interest rate derivative.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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The net cash inflow or outflow associated with the aggregate amount of adjustment to the purchase price of a previous acquisition.

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Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

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Derivative financial instruments and fair value measurements (Narrative) (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended									3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended
	Jun. 29, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 29, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 29, 2013 Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 29, 2012 Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 29, 2013 Maximum [Member] Opta Minerals Inc [Member]	Jun. 29, 2013 Minimum [Member] Opta Minerals Inc [Member]	Jun. 29, 2013 Corn [Member] bu	Jun. 29, 2013 Soybean [Member] bu	Jun. 29, 2013 Cocoa [Member] lots	Jun. 29, 2013 Interest Rate Swap [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 30, 2012 Interest Rate Swap [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 29, 2013 Interest Rate Swap [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 30, 2012 Interest Rate Swap [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 29, 2013 Interest Rate Swap [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member] CAD	Jun. 29, 2013 Interest Rate Swap [Member] Maximum [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 29, 2013 Interest Rate Swap [Member] Minimum [Member] Opta Minerals Inc [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 29, 2013 Foreign Exchange Forward [Member] USD ($)	Jun. 30, 2012 Foreign Exchange Forward [Member] USD ($)	Jun. 29, 2013 Foreign Exchange Forward [Member] USD ($)	Jun. 30, 2012 Foreign Exchange Forward [Member] USD ($)	Jun. 29, 2013 Foreign Exchange Forward [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Jun. 29, 2013 Foreign Exchange Forward [Member] Fair Value, Inputs, Level 2 [Member] EUR (€)
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (199)	$ (1,215)	$ (942)	$ (1,897)
Derivative, Nonmonetary Notional Amount											194
Inventories Carried At Market Unit									333,699	735,075
Derivative Maturity Dates												May 01, 2017
Derivative, Notional Amount																44,375
Derivative, Fixed Interest Rate																	2.02%	1.85%
Debt Instrument, Basis Spread on Variable Rate							3.50%	2.00%									3.50%	2.00%
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent												614	(147)	298	(190)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent												160	(32)	78	(35)
Notional Amount of Foreign Currency Derivative Purchase Contracts																							8,155	1,315
Unrealized Gain Loss On Foreign Currency Derivatives Net Before Tax																			(223)	(11)	391	469
Business Acquisition, Contingent Consideration, at Fair Value					0	0
Payments For Proceeds From Previous Acquisition	$ 1,074	$ 327	$ 1,074	$ 327