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Accumulated Other Comprehensive Income (Loss) Related to Derivative Transactions (Detail) (USD $) | 4 Months Ended
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Apr. 20, 2013 | Apr. 21, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | $ (8,621,000) | $ (7,009,000)
Closed Or Expiring Over The Next Four Years |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 11,700,000 |
Closed Or Expiring Over The Next Four Years | Closed Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Estimated amount of derivatives to be reclassified in income from AOCI | 7,200,000 |
Closed Or Expiring Over The Next Four Years | Expiring in 2013 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 4,400,000 |
Closed Or Expiring Over The Next Four Years | Expiring in 2016 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 100,000 |
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 10,200,000 |
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Closed Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Estimated amount of derivatives to be reclassified in income from AOCI | 5,900,000 |
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2013 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 4,200,000 |
Commodity price risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2016 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 100,000 |
Interest rate risk derivatives | Closed Or Expiring Over The Next Four Years |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 1,500,000 |
Interest rate risk derivatives | Closed Or Expiring Over The Next Four Years | Closed Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Estimated amount of derivatives to be reclassified in income from AOCI | 1,300,000 |
Interest rate risk derivatives | Closed Or Expiring Over The Next Four Years | Expiring in 2013 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | $ 200,000 |

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -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. + Details
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