Fair Value Measurements (Fair value measurements on a recurring basis) (Details) - USD ($) $ in Thousands | Mar. 27, 2016 | Dec. 27, 2015 |
Fair value, inputs, level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets at fair value | $ 26,021 | $ 16,733 |
Liabilities at fair value | 0 | 0 |
Fair value, inputs, level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets at fair value | 0 | 59 |
Liabilities at fair value | 13,623 | 11,435 |
Reported value measurement [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets at fair value | 26,021 | 16,792 |
Liabilities at fair value | 13,623 | 11,435 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Other current assets [Member] | Foreign exchange forward [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative asset, current | 0 | 0 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Accrued and other current liabilities [Member] | Foreign exchange forward [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 0 | 0 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Accrued and other current liabilities [Member] | Interest rate swap [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 0 | 0 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Accrued and other current liabilities [Member] | Commodity [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 0 | 0 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Other long-term liabilities, net [Member] | Interest rate swap [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, noncurrent | 0 | 0 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Fixed income funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents, fair value disclosure | 14,941 | 6,333 |
Restricted cash equivalents, fair value disclosure | 801 | 551 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member] | Money market funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents, fair value disclosure | 7,780 | 7,168 |
Restricted cash equivalents, fair value disclosure | 2,499 | 2,681 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Other current assets [Member] | Foreign exchange forward [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative asset, current | 0 | 59 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Accrued and other current liabilities [Member] | Foreign exchange forward [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 25 | 703 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Accrued and other current liabilities [Member] | Interest rate swap [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 5,178 | 5,142 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Accrued and other current liabilities [Member] | Commodity [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 594 | 583 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Other long-term liabilities, net [Member] | Interest rate swap [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, noncurrent | 7,826 | 5,007 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Fixed income funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents, fair value disclosure | 0 | 0 |
Restricted cash equivalents, fair value disclosure | 0 | 0 |
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member] | Money market funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents, fair value disclosure | 0 | 0 |
Restricted cash equivalents, fair value disclosure | 0 | 0 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Other current assets [Member] | Foreign exchange forward [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative asset, current | 0 | 59 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Accrued and other current liabilities [Member] | Foreign exchange forward [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 25 | 703 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Accrued and other current liabilities [Member] | Interest rate swap [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 5,178 | 5,142 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Accrued and other current liabilities [Member] | Commodity [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, current | 594 | 583 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Other long-term liabilities, net [Member] | Interest rate swap [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liability, noncurrent | 7,826 | 5,007 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Fixed income funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents, fair value disclosure | 14,941 | 6,333 |
Restricted cash equivalents, fair value disclosure | 801 | 551 |
Fair value, measurements, recurring [Member] | Reported value measurement [Member] | Money market funds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents, fair value disclosure | 7,780 | 7,168 |
Restricted cash equivalents, fair value disclosure | $ 2,499 | $ 2,681 |