Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001100682 (http://www.sec.gov/CIK)

Compensation and Retirement Disclosure [Abstract]	Period [Axis]
	2015-12-27 - 2016-12-31
Compensation and Retirement Disclosure [Abstract]
Reconciliation of Benefit Obligations and Plans Assets of the Company's Pension Plans	The following table provides a reconciliation of benefit obligations and plan assets of the Company’s pension, DCP and ESLIRP plans:   December 31, 2016   December 26, 2015           (in thousands) Change in projected benefit obligations:       Benefit obligation at beginning of year $ 345,220   $ 359,130 Service cost 2,453   4,293 Interest cost 12,046   12,974 Benefit payments (13,383 )   (8,191 ) Curtailment (279 )   — Settlements (5,499 )   — Plan amendments 188   — Transfer in from acquisition 5,271   — Actuarial loss (gain) 71,006   (10,362 ) Administrative expenses paid (605 )   (411 ) Effect of foreign exchange (36,476 )   (12,213 ) Benefit obligation at end of year $ 379,942   $ 345,220 Change in fair value of plan assets:       Fair value of plan assets at beginning of year $ 275,480   $ 281,290 Actual return on plan assets 23,388   6,263 Employer contributions 10,551   6,762 Settlements (5,499 )   — Transfer in from acquisition 508   — Benefit payments (13,383 )   (8,191 ) Administrative expenses paid (605 )   (411 ) Effect of foreign exchange (33,537 )   (10,233 ) Fair value of plan assets at end of year $ 256,903   $ 275,480         Net balance sheet liability $ 123,039   $ 69,740         Amounts recognized in balance sheet:       Noncurrent assets $ —   $ 261 Current liabilities 1,120   6,133 Noncurrent liabilities 121,919   63,868
Amounts Recognized in Accumulated Other Comprehensive Loss Related to the Company's Pensions Plans	Amounts recognized in accumulated other comprehensive loss related to the Company’s pension, DCP and ESLIRP plans are as follows:   Fiscal Year   2016   2015           (in thousands) Net actuarial loss $ 123,743   $ 73,412 Net prior service cost (credit) (3,300 )   (4,584 ) Net amount recognized $ 120,443   $ 68,828
Accumulated Benefit Obligation and Fair of Plan Assets	The accumulated benefit obligation and fair value of plan assets for the Company’s pension, DCP and ESLIRP plans with accumulated benefit obligations in excess of plan assets are as follows:   December 31, 2016   December 26, 2015           (in thousands) Accumulated benefit obligation $ 346,122   $ 306,433 Fair value of plan assets 242,172   253,225
Projected Benefit Obligation and Fair Value of Plan Assets	The projected benefit obligation and fair value of plan assets for the Company’s pension, DCP and ESLIRP plans with projected benefit obligations in excess of plan assets are as follows:   December 31, 2016   December 26, 2015           (in thousands) Projected benefit obligation $ 379,942   $ 336,155 Fair value of plan assets 256,903   266,154
Amounts in Accumulated Other Comprehensive Income Expected to Be Recognized as Components of Net Periodic Benefit Cost Over the Next Fiscal Year	The amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year are as follows:   December 31, 2016   (in thousands) Amortization of net actuarial loss $ 3,867 Amortization of net prior service credit (475 )
Components of Net Periodic Benefit Costs for the Company's Pension Plans	Components of net periodic benefit cost for the Company’s pension, DCP and ESLIRP plans are as follows:   Fiscal Year   2016   2015   2014               (in thousands) Service cost $ 2,453   $ 4,293   $ 4,155 Interest cost 12,046   12,974   13,831 Expected return on plan assets (14,164 )   (16,987 )   (17,444 ) Amortization of prior service cost (credit) (292 )   (581 )   1,211 Amortization of net loss (gain) 2,003   3,198   23 Curtailment (279 )   —   — Settlements 788   —   — Net periodic cost (benefit) $ 2,555   $ 2,897   $ 1,776
Weighted-average Assumptions	Weighted-average assumptions used to determine projected benefit obligations are as follows:   December 31, 2016   December 26, 2015 Discount rate 3.01 %   3.89 % Rate of compensation increase 3.25 %   3.17 % Weighted-average assumptions used to determine net periodic benefit cost are as follows:   December 31, 2016   December 26, 2015   December 27, 2014 Discount rate 3.89 %   3.75 %   4.44 % Expected long-term return on plan assets 5.83 %   6.24 %   6.41 % Rate of compensation increase 3.17 %   3.18 %   3.36 %
Fair Value of the Company's Pension Plan Assets by Asset Category	The fair value of the Company’s pension plan assets by asset category are as follows:   December 31, 2016   December 26, 2015   Level 1   Level 2   Level 3   Total   Level 1   Level 2   Level 3   Total                                   (in thousands) Cash $ 108   $ —   $ —   $ 108   $ 92   $ —   $ —   $ 92 Equity securities(1) 63,348   6,252   —   69,600   65,890   5,941   —   71,831 Debt securities(2)  59,294   3,269   —   62,563   68,489   2,822   —   71,311 Mutual funds(3) 64,698   56,596   —   121,294   63,689   65,725   —   129,414 Other 1,318   586   1,434   3,338   1,021   49   1,762   2,832 Total $ 188,766   $ 66,703   $ 1,434   $ 256,903   $ 199,181   $ 74,537   $ 1,762   $ 275,480 (1) This category comprises equity securities held by non-U.S. pension plans valued at the quoted closing price, and translated into U.S. dollars using a foreign currency exchange rate at year end. (2) This category comprises debt securities held by non-U.S. pension plans valued at the quoted closing price, and translated into U.S. dollars using a foreign currency exchange rate at year end. (3) This category comprises mutual funds valued at the net asset value of shares held at year end.
Estimated Future Benefit Payments Over the Next Five Years	Estimated future benefit payments during the next five years and in the aggregate for fiscal years thereafter, are as follows: Fiscal Year   Pension Plans     (in thousands) 2017   $ 8,610 2018   8,818 2019   9,682 2020   10,014 2021   30,717 Thereafter   57,705