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Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 28, 2018 | Oct. 29, 2017 | Apr. 30, 2018 | Apr. 29, 2018 | Apr. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Inventory |  | $ 50,601 | $ 50,209 |  | $ 53,454 | [1] |
Property, plant and equipment |  | 51,325 | 52,530 |  | 51,794 | [1] |
Investment in unconsolidated joint venture |  | 1,470 | 1,522 |  | 1,501 | [1] |
Total assets |  | 222,211 | 201,043 |  | 217,984 | [1] |
Cash and cash equivalents |  | 14,768 | 15,739 |  | 21,228 | [1] |
Short-term investments (Available for Sale) |  |  | 2,478 |  | 2,451 | [1] |
Short-term investments (Held-to-Maturity) |  | 26,719 | 4,015 |  | 25,759 | [1] |
Assets held for sale |  | 237 |  |  |  |  |
Other current assets |  | 2,461 | 2,263 | $ 2,897 | 2,870 | [1] |
Deferred income taxes |  | 3,614 | 491 |  | 1,458 | [1] |
Goodwill |  | 27,222 | 11,462 |  | 13,569 | [1] | $ 11,462
Intangible assets |  | 10,636 | 1,428 |  | 4,275 | [1] |
Long-term investments (Held-to-Maturity) |  |  | 26,853 |  | 5,035 | [1] |
Long-term investments (Rabbi Trust) |  | 7,851 | 6,921 |  | 7,326 | [1] |
Other assets |  | 945 | 912 |  | 957 | [1] |
Capital expenditures | [2] | 1,845 | 4,597 |  |  |  |
Depreciation expense |  | 4,056 | 3,713 |  |  |  |
Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total assets |  | 127,306 | 127,979 |  | 132,504 |  |
Operating Segments [Member] | Mattress Fabrics [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | 10,740 | 13,645 |  | 15,195 |  |
Inventory |  | 29,836 | 29,083 |  | 28,740 |  |
Property, plant and equipment | [3] | 48,825 | 49,965 |  | 48,797 |  |
Investment in unconsolidated joint venture |  | 1,470 | 1,522 |  | 1,501 |  |
Total assets |  | 90,871 | 94,215 |  | 94,233 |  |
Capital expenditures |  | 1,578 | 4,364 |  |  |  |
Depreciation expense |  | 3,644 | 3,310 |  |  |  |
Operating Segments [Member] | Upholstery Fabrics [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | 13,622 | 10,575 |  | 11,112 |  |
Inventory |  | 20,765 | 21,126 |  | 24,714 |  |
Property, plant and equipment | [4] | 2,048 | 2,063 |  | 2,445 |  |
Total assets |  | 36,435 | 33,764 |  | 38,271 |  |
Capital expenditures |  | 267 | 203 |  |  |  |
Depreciation expense |  | 412 | 403 |  |  |  |
Unallocated Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Property, plant and equipment | [5] | 452 | 502 |  | 552 |  |
Cash and cash equivalents |  | 14,768 | 15,739 |  | 21,228 |  |
Short-term investments (Available for Sale) |  |  | 2,478 |  | 2,451 |  |
Short-term investments (Held-to-Maturity) |  | 26,719 | 4,015 |  | 25,759 |  |
Assets held for sale |  | 237 |  |  |  |  |
Other current assets |  | 2,461 | 2,263 |  | 2,870 |  |
Deferred income taxes |  | 3,614 | 491 |  | 1,458 |  |
Goodwill |  | 27,222 | 11,462 |  | 13,569 |  |
Intangible assets |  | 10,636 | 1,428 |  | 4,275 |  |
Long-term investments (Held-to-Maturity) |  |  | 26,853 |  | 5,035 |  |
Long-term investments (Rabbi Trust) |  | 7,851 | 6,921 |  | 7,326 |  |
Other assets |  | $ 945 | 912 |  | $ 957 |  |
Capital expenditures |  |  | $ 30 |  |  |  |
[1] | Derived from audited financial statements.
[2] | Capital expenditure amounts are stated on the accrual basis. See Consolidated Statements of Cash Flows for capital expenditure amounts on a cash basis.
[3] | The $48.8 million at October 28, 2018, represents property, plant, and equipment of $36.1 million and $12.7 million located in the U.S. and Canada, respectively. The $50.0 million at October 29, 2017, represents property, plant, and equipment of $35.8 million and $14.2 million located in the U.S. and Canada, respectively. The $48.8 million at April 29, 2018, represents property, plant, and equipment of $35.4 million and $13.4 million located in the U.S. and Canada, respectively.
[4] | The $2.0 million at October 28, 2018, represents property, plant, and equipment of $1.4 million and $636 located in the U.S. and China, respectively. The $2.1 million at October 29, 2017, represents property, plant, and equipment of $1.4 million and $722 located in the U.S. and China, respectively. The $2.4 million at April 29, 2018, represents property, plant, and equipment of $1.8 million and $661 located in the U.S. and China, respectively.
[5] | The $452, $502, and $552 at October 28, 2018, October 29, 2017 and April 29, 2018, respectively, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments. Property, plant, and equipment associated with corporate are located in the U.S.

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