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Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
non-compete agreements, net |  | $ 753 |  |  |  |  | $ 828 |  |  |  |  | $ 753 |  | $ 828 |  | $ 903 |  | $ 978
customer relationships |  | 2,839 |  |  |  |  | 664 |  |  |  |  | 2,839 |  | 664 |  | 715 |  | 766
goodwill |  | 13,569 |  |  |  |  | 11,462 |  |  |  |  | 13,569 |  | 11,462 |  | 11,462 |  | 11,462
investment in unconsolidated joint venture |  | 1,501 |  |  |  |  | 1,106 |  |  |  |  | 1,501 |  | 1,106 |  |  |  |
property, plant, and equipment |  | 51,794 |  | $ 51,838 | $ 52,530 | $ 52,912 | 51,651 |  | $ 50,333 | $ 45,537 | $ 41,745 | 51,794 |  | 51,651 |  |  |  |
total assets |  | 217,984 |  | 216,844 | 201,043 | 207,904 | 205,634 |  | 191,056 | 179,127 | 183,360 | 217,984 |  | 205,634 |  | 175,142 |  |
tradename |  | 683 |  |  |  |  |  |  |  |  |  | 683 |  |  |  |  |  |
cash and cash equivalents |  | 21,228 |  |  |  |  | 20,795 |  |  |  |  | 21,228 |  | 20,795 |  | 37,787 |  | $ 29,725
short-term investments - available for sale |  | 2,451 |  |  |  |  | 2,443 |  |  |  |  | 2,451 |  | 2,443 |  |  |  |
short-term investments - held-to-maturity |  | 25,759 |  |  |  |  |  |  |  |  |  | 25,759 |  |  |  |  |  |
deferred income taxes |  | 1,458 |  |  |  |  | 419 |  |  |  |  | 1,458 |  | 419 |  |  |  |
other current assets |  | 2,870 |  |  |  |  | 2,894 |  |  |  |  | 2,870 |  | 2,894 |  |  |  |
long-term investments - held-to-maturity |  | 5,035 |  |  |  |  | 30,945 |  |  |  |  | 5,035 |  | 30,945 |  |  |  |
long-term investments - rabbi trust |  | 7,326 |  |  |  |  | 5,466 |  |  |  |  | 7,326 |  | 5,466 |  |  |  |
other assets |  | 5,232 |  |  |  |  | 2,394 |  |  |  |  | 5,232 |  | 2,394 |  |  |  |
capital expenditures |  | 1,568 |  | 1,274 | 1,529 | 3,068 | 3,097 |  | 6,590 | 5,541 | 3,543 | 7,439 | [1] | 18,771 | [1] | 10,708 | [1] |
Depreciation expense |  | 1,992 |  | $ 1,966 | $ 1,905 | $ 1,807 | 1,781 |  | $ 1,793 | $ 1,751 | $ 1,761 | 7,672 |  | 7,085 |  | 6,671 |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
total assets |  | 150,348 |  |  |  |  | 140,914 |  |  |  |  | 150,348 |  | 140,914 |  | 122,136 |  |
Operating Segments [Member] | Mattress Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
current assets | [2] | 43,935 |  |  |  |  | 47,038 |  |  |  |  | 43,935 |  | 47,038 |  | 43,472 |  |
non-compete agreements, net |  | 753 |  |  |  |  | 828 |  |  |  |  | 753 |  | 828 |  | 903 |  |
customer relationships |  | 613 |  |  |  |  | 664 |  |  |  |  | 613 |  | 664 |  | 715 |  |
goodwill |  | 11,462 |  |  |  |  | 11,462 |  |  |  |  | 11,462 |  | 11,462 |  | 11,462 |  |
investment in unconsolidated joint venture |  | 1,501 |  |  |  |  | 1,106 |  |  |  |  | 1,501 |  | 1,106 |  |  |  |
property, plant, and equipment |  | 48,797 | [3] |  |  |  | 48,916 | [4] |  |  |  | 48,797 | [3] | 48,916 | [4] | 37,480 | [5] |
total assets |  | 107,061 |  |  |  |  | 110,014 |  |  |  |  | 107,061 |  | 110,014 |  | 94,032 |  |
capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 6,713 |  | 17,689 |  | 9,666 |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  | 6,850 |  | 6,245 |  | 5,837 |  |
Operating Segments [Member] | Upholstery Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
current assets | [2] | 35,826 |  |  |  |  | 29,021 |  |  |  |  | 35,826 |  | 29,021 |  | 26,540 |  |
customer relationships |  | 2,226 |  |  |  |  |  |  |  |  |  | 2,226 |  |  |  |  |  |
goodwill |  | 2,107 |  |  |  |  |  |  |  |  |  | 2,107 |  |  |  |  |  |
property, plant, and equipment |  | 2,445 | [6] |  |  |  | 1,879 | [7] |  |  |  | 2,445 | [6] | 1,879 | [7] | 1,564 | [8] |
total assets |  | 43,287 |  |  |  |  | 30,900 |  |  |  |  | 43,287 |  | 30,900 |  | 28,104 |  |
tradename |  | 683 |  |  |  |  |  |  |  |  |  | 683 |  |  |  |  |  |
capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 488 |  | 822 |  | 626 |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  | 822 |  | 840 |  | 834 |  |
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
property, plant, and equipment | [9] | 552 |  |  |  |  | 856 |  |  |  |  | 552 |  | 856 |  | 929 |  |
cash and cash equivalents |  | 21,228 |  |  |  |  | 20,795 |  |  |  |  | 21,228 |  | 20,795 |  | 37,787 |  |
short-term investments - available for sale |  | 2,451 |  |  |  |  | 2,443 |  |  |  |  | 2,451 |  | 2,443 |  | 4,359 |  |
short-term investments - held-to-maturity |  | 25,759 |  |  |  |  |  |  |  |  |  | 25,759 |  |  |  |  |  |
income taxes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 155 |  |
deferred income taxes |  | 1,458 |  |  |  |  | 419 |  |  |  |  | 1,458 |  | 419 |  | 2,319 |  |
other current assets |  | 2,870 |  |  |  |  | 2,894 |  |  |  |  | 2,870 |  | 2,894 |  | 2,477 |  |
long-term investments - held-to-maturity |  | 5,035 |  |  |  |  | 30,945 |  |  |  |  | 5,035 |  | 30,945 |  |  |  |
long-term investments - rabbi trust |  | 7,326 |  |  |  |  | 5,466 |  |  |  |  | 7,326 |  | 5,466 |  | 4,025 |  |
other assets |  | $ 957 |  |  |  |  | $ 902 |  |  |  |  | 957 |  | 902 |  | 955 |  |
capital expenditures |  |  |  |  |  |  |  |  |  |  |  | $ 238 |  | $ 260 |  | $ 416 |  |
[1] | Capital expenditure amounts are stated on an accrual basis. See Consolidated Statement of Cash Flows for capital expenditure amounts on a cash basis.
[2] | Current assets represent accounts receivable and inventory.
[3] | The $48.8 million at April 29, 2018, represents property, plant, and equipment located in the U.S. of $35.4 million and located in Canada of $13.4 million.
[4] | The $48.9 million at April 30, 2017, represents property, plant, and equipment located in the U.S. of $34.0 million and located in Canada of $14.9 million.
[5] | The $37.5 million at May 1, 2016, represents property, plant, and equipment located in the U.S. of $24.8 million and located in Canada of $12.7 million.
[6] | The $2.4 million at April 29, 2018, represents property, plant, and equipment located in the U.S. of $1.8 million and located in China of $661.
[7] | The $1.9 million at April 30, 2017, represents property, plant, and equipment located in the U.S. of $1.2 million and located in China of $655.
[8] | The $1.6 million at May 1, 2016, represents property, plant, and equipment located in the U.S. of $893 and located in China of $671.
[9] | The $552, $856, and $929 balance at April 29, 2018, April 30, 2017, and May 1, 2016, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments located in the U.S.

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