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Inventories (Inventory reserve rollforward) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Beginning Balance $ 4,723us-gaap_InventoryValuationReserves $ 4,448us-gaap_InventoryValuationReserves
Additions to reserve during the year 11,461us-gaap_InventoryWriteDown 2,824us-gaap_InventoryWriteDown
Reserves applied and inventories written off during the year 9,953stkl_InventoryRecoveries 2,555stkl_InventoryRecoveries
Effect of foreign exchange rate differences 87stkl_EffectsOfForeignExchangeRateDifferencesInventories (6)stkl_EffectsOfForeignExchangeRateDifferencesInventories
Ending Balance $ 6,144us-gaap_InventoryValuationReserves $ 4,723us-gaap_InventoryValuationReserves