Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Detail) (USD $) | Dec. 29, 2013 | Dec. 30, 2012 | Dec. 25, 2011 |
In Thousands, unless otherwise specified |
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) |
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[1] | The company uses a Dec. 31 measurement date for its retirement plans. |