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Derivative financial instruments and fair value measurements (Narrative) (Details)
In Thousands, unless otherwise specified |
1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Feb. 29, 2012
|
Dec. 28, 2013
USD ($)
|
Dec. 28, 2013
Fair Value, Inputs, Level 2 [Member]
USD ($)
|
Dec. 29, 2012
Fair Value, Inputs, Level 2 [Member]
USD ($)
|
Feb. 10, 2012
Babco [Member]
USD ($)
|
Dec. 28, 2013
Maximum [Member]
Opta Minerals Inc [Member]
|
Oct. 31, 2013
Maximum [Member]
Opta Minerals Inc [Member]
|
Dec. 28, 2013
Minimum [Member]
Opta Minerals Inc [Member]
|
Dec. 28, 2013
Corn [Member]
Fair Value, Inputs, Level 2 [Member]
bu
|
Dec. 28, 2013
Soybean [Member]
Fair Value, Inputs, Level 2 [Member]
bu
|
Dec. 28, 2013
Cocoa [Member]
lots
|
Dec. 28, 2013
Interest Rate Swap [Member]
Opta Minerals Inc [Member]
|
Dec. 28, 2013
Interest Rate Swap [Member]
Opta Minerals Inc [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
|
Dec. 29, 2012
Interest Rate Swap [Member]
Opta Minerals Inc [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
|
Dec. 31, 2011
Interest Rate Swap [Member]
Opta Minerals Inc [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
|
Dec. 28, 2013
Interest Rate Swap [Member]
Opta Minerals Inc [Member]
Fair Value, Inputs, Level 2 [Member]
CAD
|
Dec. 28, 2013
Interest Rate Swap [Member]
Maximum [Member]
Opta Minerals Inc [Member]
Fair Value, Inputs, Level 2 [Member]
|
Dec. 28, 2013
Interest Rate Swap [Member]
Minimum [Member]
Opta Minerals Inc [Member]
Fair Value, Inputs, Level 2 [Member]
|
Dec. 28, 2013
Foreign Exchange Forward [Member]
USD ($)
|
Dec. 29, 2012
Foreign Exchange Forward [Member]
USD ($)
|
Dec. 31, 2011
Foreign Exchange Forward [Member]
USD ($)
|
Dec. 28, 2013
Foreign Exchange Forward [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
|
Dec. 28, 2013
Foreign Exchange Forward [Member]
Fair Value, Inputs, Level 2 [Member]
EUR (€)
|
Dec. 28, 2013
Not Designated as Hedging Instrument [Member]
USD ($)
|
Dec. 29, 2012
Not Designated as Hedging Instrument [Member]
USD ($)
|
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
USD ($)
|
|
| Derivative [Line Items] | ||||||||||||||||||||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 1,976 | $ 695 | $ 839 | |||||||||||||||||||||||
| Derivative, Nonmonetary Notional Amount | 168 | |||||||||||||||||||||||||
| Inventories Carried At Market Unit | 212,026 | 623,739 | ||||||||||||||||||||||||
| Derivative, Inception Date | Feb. 01, 2012 | |||||||||||||||||||||||||
| Derivative, Notional Amount | 41,925 | |||||||||||||||||||||||||
| Derivative, Fixed Interest Rate | 2.02% | 1.85% | ||||||||||||||||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 5.00% | 3.50% | 2.00% | 3.50% | 2.00% | |||||||||||||||||||||
| Derivative, Maturity Date | Feb. 01, 2017 | May 01, 2017 | ||||||||||||||||||||||||
| Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent | (85) | 140 | (635) | |||||||||||||||||||||||
| Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent | (20) | 53 | (195) | |||||||||||||||||||||||
| Notional Amount of Foreign Currency Derivative Purchase Contracts | 19,434 | 14,144 | ||||||||||||||||||||||||
| Unrealized Gain Loss On Foreign Currency Derivatives Net Before Tax | (44) | (327) | (149) | |||||||||||||||||||||||
| Business Acquisition, Contingent Consideration, at Fair Value | 0 | 0 | (615) | |||||||||||||||||||||||
| Business Acquisition Contingent Consideration Payments | $ (1,267) | |||||||||||||||||||||||||