v2.4.0.8

Derivative financial instruments and fair value measurements (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis ) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011 | Feb. 10, 2012 Babco [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 1 [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 1 [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 1 [Member] Interest Rate Swap [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 1 [Member] Interest Rate Swap [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 1 [Member] Foreign Exchange Forward [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 1 [Member] Foreign Exchange Forward [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 1 [Member] Other Current [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 1 [Member] Other Current [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 1 [Member] Other Long Term [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 1 [Member] Other Long Term [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 2 [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 2 [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 2 [Member] Interest Rate Swap [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 2 [Member] Interest Rate Swap [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 2 [Member] Foreign Exchange Forward [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 2 [Member] Foreign Exchange Forward [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 2 [Member] Other Current [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 2 [Member] Other Current [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 2 [Member] Other Long Term [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 2 [Member] Other Long Term [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 3 [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 3 [Member] Interest Rate Swap [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] Interest Rate Swap [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 3 [Member] Foreign Exchange Forward [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] Foreign Exchange Forward [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 3 [Member] Other Current [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] Other Current [Member] | Dec. 28, 2013 Fair Value, Inputs, Level 3 [Member] Other Long Term [Member] | Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member] Other Long Term [Member] | Dec. 28, 2013 Fair Value, Measurements, Recurring [Member] | Dec. 29, 2012 Fair Value, Measurements, Recurring [Member] | Dec. 28, 2013 Fair Value, Measurements, Recurring [Member] Interest Rate Swap [Member] | Dec. 29, 2012 Fair Value, Measurements, Recurring [Member] Interest Rate Swap [Member] | Dec. 28, 2013 Fair Value, Measurements, Recurring [Member] Foreign Exchange Forward [Member] | Dec. 29, 2012 Fair Value, Measurements, Recurring [Member] Foreign Exchange Forward [Member] | Dec. 28, 2013 Fair Value, Measurements, Recurring [Member] Other Current [Member] | Dec. 29, 2012 Fair Value, Measurements, Recurring [Member] Other Current [Member] | Dec. 28, 2013 Fair Value, Measurements, Recurring [Member] Other Long Term [Member] | Dec. 29, 2012 Fair Value, Measurements, Recurring [Member] Other Long Term [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Derivative Gain |  |  |  |  |  |  |  |  |  |  | $ 284 | $ 690 | $ 0 | $ 0 |  |  |  |  |  |  | $ 1,175 | $ 2,494 | $ 29 | $ 93 |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  | $ 1,459 | $ 3,184 | $ 29 | $ 93
Unrealized Derivative Loss |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  | (1,841) | (1,623) | (12) | (43) |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  | (1,841) | (1,623) | (12) | (43)
Inventories Carried At Market |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  | 11,836 | 15,426 |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  | 11,836 | 15,426 |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | (1,976) | 695 | (839) |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  | (311) | (396) | (371) | (327) |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  | (311) | (396) | (371) | (327) |  |  |  |
Business Acquisition, Contingent Consideration, at Fair Value |  |  |  | (615) | 0 | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  | 2,671 | 4,398 |  |  |  |  |  |  |  |  | 2,671 | 4,398 |  |  |  |  |  |  |  |
Business Acquisition Contingent Consideration Payments | $ (1,267) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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