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Merger - Pro Forma Effect on Operating Results (Detail) (Nash-Finch Company [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jul. 20, 2013 | Jul. 20, 2013
Nash-Finch Company [Member] |  |
Business Acquisition [Line Items] |  |
Net sales | $ 1,867,080 | $ 4,132,219
Net earnings | $ 17,519 | $ 28,106

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