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Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 30, 2012 | Dec. 25, 2011 | Dec. 26, 2010
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | $ 2,594,250 | [1] | $ 2,518,515 | [1] |
Fair value of pension plan liabilities | (85,250) | [1] | (128,547) | [1] |
Cash and other | 43,316 | [1] | 18,800 | [1] |
Total net fair value of plan assets | 2,552,316 | [1] | 2,408,768 | [1] |
U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 100,140 | [1] | 50,582 | [1] |
Mortgage Backed Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 71,641 | [1] | 166,922 | [1] |
Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 30,317 | [1] | 39,687 | [1] |
Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 137,437 | [1] | 137,705 | [1] |
Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 723,437 | [1] | 614,975 | [1] |
Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 97,385 | [1] | 93,620 | [1] |
Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 604,003 | [1] | 434,693 | [1] |
Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 193,620 | [1] | 373,368 | [1] |
Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 128,418 | [1] | 112,767 | [1] |
Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 84,956 | [1] | 79,432 | [1] |
Partnership/joint venture interests |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 130,995 | [1] | 128,121 | [1] |
Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 236,444 | [1] | 232,817 | [1] |
Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 55,457 | [1] | 53,826 | [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] | (71,876) | [1] |
Derivative liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan liabilities | (58,368) | [1] | (56,671) | [1] |
Fair Value, Inputs, Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 839,478 | [1] | 731,448 | [1] |
Fair value of pension plan liabilities | (21) | [1] | (15) | [1] |
Cash and other | 36,295 | [1] | 18,135 | [1] |
Total net fair value of plan assets | 875,752 | [1] | 749,568 | [1] |
Fair Value, Inputs, Level 1 | U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 722,619 | [1] | 613,976 | [1] |
Fair Value, Inputs, Level 1 | Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 12,630 | [1] | 24,632 | [1] |
Fair Value, Inputs, Level 1 | Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 104,196 | [1] | 92,840 | [1] |
Fair Value, Inputs, Level 1 | Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 1 | Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 33 | [1] | 0 | [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 | (21) | [1] | (15) | [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] | 0 | [1] |
Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 1,366,171 | [1] | 1,404,293 | [1] |
Fair value of pension plan liabilities | (83,221) | [1] | (126,015) | [1] |
Cash and other | 7,021 | [1] | 665 | [1] |
Total net fair value of plan assets | 1,289,971 | [1] | 1,278,943 | [1] |
Fair Value, Inputs, Level 2 | U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 100,140 | [1] | 50,582 | [1] |
Fair Value, Inputs, Level 2 | Mortgage Backed Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 71,641 | [1] | 165,651 | [1] |
Fair Value, Inputs, Level 2 | Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 30,317 | [1] | 38,246 | [1] |
Fair Value, Inputs, Level 2 | Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 136,640 | [1] | 135,635 | [1] |
Fair Value, Inputs, Level 2 | Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 818 | [1] | 999 | [1] |
Fair Value, Inputs, Level 2 | Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 2 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 604,003 | [1] | 434,693 | [1] |
Fair Value, Inputs, Level 2 | Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 180,990 | [1] | 348,736 | [1] |
Fair Value, Inputs, Level 2 | Interest in reg. invest. companies |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 24,222 | [1] | 19,927 | [1] |
Fair Value, Inputs, Level 2 | Interest in 103-12 investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 84,956 | [1] | 79,432 | [1] |
Fair Value, Inputs, Level 2 | Partnership/joint venture interests |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 2 | Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 77,520 | [1] | 76,801 | [1] |
Fair Value, Inputs, Level 2 | Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 54,924 | [1] | 53,591 | [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 | (56,339) | [1] | (54,139) | [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] | (71,876) | [1] |
Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 388,601 | [1] | 382,774 | [1] | 378,917
Fair value of pension plan liabilities | (2,008) | [1] | (2,517) | [1] |
Cash and other | 0 | [1] | 0 | [1] |
Total net fair value of plan assets | 386,593 | [1] | 380,257 | [1] |
Fair Value, Inputs, Level 3 | U.S. government-related securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 1,271 | [1] | 0
Fair Value, Inputs, Level 3 | Other government bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 1,441 | [1] | 1,526
Fair Value, Inputs, Level 3 | Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 797 | [1] | 2,070 | [1] | 5,896
Fair Value, Inputs, Level 3 | Corporate stock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Real estate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 97,385 | [1] | 93,620 | [1] | 90,344
Fair Value, Inputs, Level 3 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 0 | [1] | 0 | [1] |
Fair Value, Inputs, Level 3 | Fixed Income |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 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] |  |  |  |  |
Fair value of pension plan assets | 130,995 | [1] | 128,121 | [1] | 117,698
Fair Value, Inputs, Level 3 | Hedge funds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 158,924 | [1] | 156,016 | [1] | 163,349
Fair Value, Inputs, Level 3 | Derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of pension plan assets | 500 | [1] | 235 | [1] | 104
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] | (2,517) | [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] | 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) |  | $ (2,517) |  | $ (453)
[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 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 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=21915506&loc=d3e2417-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: 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=21915506&loc=d3e2410-114920 Reference 8: 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=21915506&loc=d3e1928-114920 + 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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=21915506&loc=d3e1928-114920 + Details
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