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Derivative Financial Instruments - Additional Information (Detail) (USD $) | 4 Months Ended |  |  |  |  |  | 4 Months Ended
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Apr. 20, 2013 | Apr. 21, 2012 | Jul. 21, 2012 | Apr. 20, 2013 Other Current Assets | Dec. 29, 2012 Other Current Assets | Apr. 20, 2013 Interest Rate Contracts ButterKrust | Aug. 01, 2008 Interest Rate Contracts ButterKrust | Aug. 01, 2008 Interest Rate Contracts Holsum | Apr. 20, 2013 Interest rate risk derivatives
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Commodity derivatives fair value, net | $ (6,800,000) |  |  |  |  |  |  |  |
Cash settlement on hedge | 3,100,000 |  |  |  |  |  |  |  |
Notional amount of interest rate swap |  |  |  |  |  | 33,800,000 | 85,000,000 | 65,000,000 |
Term loan outstanding | 150,000,000 |  | 20,000,000 |  |  |  |  |  |
Fair value of interest rate swaps | (300,000) |  |  |  |  |  |  |  |
Interest expense | 8,819,000 | 4,229,000 |  |  |  |  |  |  | 500,000
Derivative instrument, asset |  |  |  | $ 17,800,000 | $ 9,000,000 |  |  |  |

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- Definition Fair value as of the balance sheet date of all price risk derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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