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Business Combination - Mattress Fabric Segment - Unaudited Pro Forma Consolidated Results of Operations (Detail) (Bodet And Horst [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Oct. 27, 2013 | Oct. 28, 2012 | Oct. 27, 2013 | Oct. 28, 2012
Bodet And Horst [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net Sales | $ 70,589 | $ 68,027 | $ 140,730 | $ 139,678
Income from operations | 5,035 | 4,659 | 11,009 | 10,129
Net income | $ 3,096 | $ 8,192 | $ 6,326 | $ 11,675
Net income per share, basic | $ 0.25 | $ 0.67 | $ 0.52 | $ 0.94
Net income per share, diluted | $ 0.25 | $ 0.66 | $ 0.51 | $ 0.93

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