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Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 29, 2013 | Dec. 30, 2012 | Dec. 25, 2011
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | $ 2,978,584 | [1] | $ 2,594,250 | [1] |
Fair value of pension plan liabilities | (11,502) | [1] | (85,250) | [1] |
Cash and other | 61,385 | [1] | 43,316 | [1] |
Fair value of pension plan assets | 3,028,467 | [1] | 2,552,316 | [1] |
U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 3,313 | [1] | 100,140 | [1] |
Mortgage Backed Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 3,975 | [1] | 71,641 | [1] |
Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 72,748 | [1] | 30,317 | [1] |
Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 31,087 | [1] | 137,437 | [1] |
Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 1,051,550 | [1] | 723,437 | [1] |
Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 98,909 | [1] | 97,385 | [1] |
Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 750,006 | [1] | 604,003 | [1] |
Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 145,897 | [1] | 193,620 | [1] |
Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 323,639 | [1] | 128,418 | [1] |
Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 28,691 | [1] | 84,956 | [1] |
Partnership/joint venture interests |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 184,952 | [1] | 130,995 | [1] |
Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 272,676 | [1] | 236,444 | [1] |
Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 11,141 | [1] | 55,457 | [1] |
Liability to purchase U.S. government and other securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities |  |  | (26,882) | [1] |
Derivative liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities | (11,502) | [1] | (58,368) | [1] |
Fair Value, Inputs, Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 1,173,934 | [1] | 826,848 | [1] |
Fair value of pension plan liabilities | (8) | [1] | (21) | [1] |
Cash and other | 60,271 | [1] | 36,295 | [1] |
Fair value of pension plan assets | 1,234,197 | [1] | 863,122 | [1] |
Fair Value, Inputs, Level 1 | U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Mortgage Backed Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 892,883 | [1] | 722,619 | [1] |
Fair Value, Inputs, Level 1 | Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 281,029 | [1] | 104,196 | [1] |
Fair Value, Inputs, Level 1 | Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Partnership/joint venture interests |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 22 | [1] | 33 | [1] |
Fair Value, Inputs, Level 1 | Derivative liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities | (8) | [1] | (21) | [1] |
Fair Value, Inputs, Level 1 | Liability to purchase U.S. government and other securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities |  |  | 0 | [1] |
Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 1,305,784 | [1] | 1,378,801 | [1] |
Fair value of pension plan liabilities | (9,486) | [1] | (83,221) | [1] |
Cash and other | 1,114 | [1] | 7,021 | [1] |
Fair value of pension plan assets | 1,297,412 | [1] | 1,302,601 | [1] |
Fair Value, Inputs, Level 2 | U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 3,313 | [1] | 100,140 | [1] |
Fair Value, Inputs, Level 2 | Mortgage Backed Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 3,975 | [1] | 71,641 | [1] |
Fair Value, Inputs, Level 2 | Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 72,748 | [1] | 30,317 | [1] |
Fair Value, Inputs, Level 2 | Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 29,834 | [1] | 136,640 | [1] |
Fair Value, Inputs, Level 2 | Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 158,667 | [1] | 818 | [1] |
Fair Value, Inputs, Level 2 | Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 2 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 750,006 | [1] | 604,003 | [1] |
Fair Value, Inputs, Level 2 | Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 145,897 | [1] | 193,620 | [1] |
Fair Value, Inputs, Level 2 | Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 42,610 | [1] | 24,222 | [1] |
Fair Value, Inputs, Level 2 | Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 28,691 | [1] | 84,956 | [1] |
Fair Value, Inputs, Level 2 | Partnership/joint venture interests |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 36,402 | [1] | 0 | [1] |
Fair Value, Inputs, Level 2 | Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 22,685 | [1] | 77,520 | [1] |
Fair Value, Inputs, Level 2 | Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 10,956 | [1] | 54,924 | [1] |
Fair Value, Inputs, Level 2 | Derivative liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities | (9,486) | [1] | (56,339) | [1] |
Fair Value, Inputs, Level 2 | Liability to purchase U.S. government and other securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities |  |  | (26,882) | [1] |
Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 498,866 | [1] | 388,601 | [1] | 382,774
Fair value of pension plan liabilities | (2,008) | [1] | (2,008) | [1] |
Cash and other | 0 | [1] | 0 | [1] |
Fair value of pension plan assets | 496,858 | [1] | 386,593 | [1] |
Fair Value, Inputs, Level 3 | U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Mortgage Backed Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] | 1,271
Fair Value, Inputs, Level 3 | Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] | 1,441
Fair Value, Inputs, Level 3 | Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 1,253 | [1] | 797 | [1] | 2,070
Fair Value, Inputs, Level 3 | Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 98,909 | [1] | 97,385 | [1] | 93,620
Fair Value, Inputs, Level 3 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Partnership/joint venture interests |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 148,550 | [1] | 130,995 | [1] | 128,121
Fair Value, Inputs, Level 3 | Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 249,991 | [1] | 158,924 | [1] | 156,016
Fair Value, Inputs, Level 3 | Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets only | 163 | [1] | 500 | [1] | 235
Fair Value, Inputs, Level 3 | Derivative liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities | (2,008) | [1] | (2,008) | [1] |
Fair Value, Inputs, Level 3 | Liability to purchase U.S. government and other securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities |  |  | 0 | [1] |
Fair Value, Inputs, Level 3 | Derivative liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities | $ (2,008) |  | $ (2,008) |  | $ (2,517)
[1] | The company uses a Dec. 31 measurement date for its retirement plans.

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- Definition This represents the entire liability recognized in the balance sheet that is associated with the defined benefit pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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