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Revenue - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 28, 2018 | Oct. 29, 2017 | Oct. 28, 2018 | Oct. 29, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | $ 77,006 | $ 80,698 | $ 148,479 | $ 160,230
Transferred at Point in Time [Member] | Product [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | 73,866 |  | 142,850 |
Transferred over Time [Member] | Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | 3,140 |  | 5,629 |
Mattress Fabrics [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | 41,989 |  | 78,972 |
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | 41,989 |  | 78,972 |
Upholstery Fabrics [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | 35,017 |  | 69,507 |
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | 31,877 |  | 63,878 |
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Net Sales | $ 3,140 |  | $ 5,629 |

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