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Business Combination Achieved in Stages - Narrative (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2021 USD ($) ft² | Jan. 30, 2022 USD ($) | Jan. 31, 2021 USD ($) | Jan. 30, 2022 USD ($) | Jan. 31, 2021 USD ($) | Jan. 01, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% |  | 50.00% |
Net sales related to inventory shipments in supply agreement |  | $ 374,000 |  | $ 1,200,000 |  |
Charges related to rebate agreement |  | $ 16,000 |  | $ 53,000 |  |
(Loss) income from investment in unconsolidated joint venture |  |  | $ (136,000) |  | $ 31,000 |
Proportionate share |  |  | 50.00% |  | 50.00% |
Investment in unconsolidated joint venture |  |  | $ 1,723,000 |  | $ 1,723,000 |
CIH [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.00%
Acquisition of additional ownership percentage | 50.00% |  |  |  |  |
Area of additional plant facility | ft² | 120,000 |  |  |  |  |
Date of acquisition | Feb. 01, 2021 |  |  |  |  |
Consideration transferred | $ 2,678,000 |  |  |  |  |
Payment for acquisition | 954,000 |  |  |  |  |
Fair value of previously held ownership interest | $ 1,700,000 |  |  |  |  |
Majority ownership percentage acquired | 100.00% |  |  |  |  |
Gain loss on remeasurement of previously held ownership interest | $ 0 |  |  |  |  |
Gain on bargain purchase | 819,000 |  |  |  |  |
Proportionate share |  |  |  |  |  | 50.00%
CIH [Member] | Mattress Fabrics [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | 2,700,000 |  |  |  |  |
Fair value of the identifiable assets acquired, and liabilities assumed | 3,500,000 |  |  |  |  |
Gain on bargain purchase | $ 819,000 |  |  |  |  |
CIH [Member] | Minimum [Member] | Equipment and Leasehold Improvements [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, remaining useful life |  |  |  | 1 year |  |
CIH [Member] | Maximum [Member] | Equipment and Leasehold Improvements [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, remaining useful life |  |  |  | 10 years |  |

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