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Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | May 01, 2016 | Jan. 31, 2016 | Nov. 01, 2015 | Aug. 02, 2015 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015 | Apr. 27, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
cash and cash equivalents |  | $ 20,795 |  |  |  |  | $ 37,787 |  |  |  |  | $ 20,795 |  | $ 37,787 |  | $ 29,725 |  | $ 29,303
short-term investments |  | 2,443 |  |  |  |  | 4,359 |  |  |  |  | 2,443 |  | 4,359 |  |  |  |
non-compete agreements, net |  | 828 |  |  |  |  | 903 |  |  |  |  | 828 |  | 903 |  |  |  |
income taxes receivable |  |  |  |  |  |  | 155 |  |  |  |  |  |  | 155 |  |  |  |
customer relationships |  | 664 |  |  |  |  | 715 |  |  |  |  | 664 |  | 715 |  |  |  |
deferred income taxes |  | 419 |  |  |  |  | 2,319 |  |  |  |  | 419 |  | 2,319 |  |  |  |
goodwill |  | 11,462 |  |  |  |  | 11,462 |  |  |  |  | 11,462 |  | 11,462 |  | 11,462 |  | $ 11,462
other current assets |  | 2,894 |  |  |  |  | 2,477 |  |  |  |  | 2,894 |  | 2,477 |  |  |  |
investment in unconsolidated joint venture |  | 1,106 |  |  |  |  |  |  |  |  |  | 1,106 |  |  |  |  |  |
property, plant and equipment |  | 51,651 |  | $ 50,333 | $ 45,537 | $ 41,745 | 39,973 |  | $ 38,157 | $ 38,319 | $ 37,480 | 51,651 |  | 39,973 |  |  |  |
long-term investments - held-to-maturity |  | 30,945 |  |  |  |  |  |  |  |  |  | 30,945 |  |  |  |  |  |
total assets |  | 205,634 |  | 191,056 | 179,127 | 183,360 | 175,142 |  | 173,551 | 168,947 | 166,880 | 205,634 |  | 175,142 |  | 171,300 |  |
long-term investments - rabbi trust |  | 5,466 |  |  |  |  | 4,025 |  |  |  |  | 5,466 |  | 4,025 |  |  |  |
capital expenditures |  | 3,097 |  | 6,590 | 5,541 | 3,543 | 3,631 |  | 1,542 | 2,575 | 2,960 | 18,771 | [1] | 10,708 | [1] | 11,174 | [1] |
other assets |  | 2,394 |  |  |  |  | 2,573 |  |  |  |  | 2,394 |  | 2,573 |  |  |  |
depreciation expense |  | 1,781 |  | $ 1,793 | $ 1,751 | $ 1,761 | 1,783 |  | $ 1,705 | $ 1,629 | $ 1,555 | 7,085 |  | 6,671 |  | 5,773 |  |
Mattress Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
goodwill |  | 11,462 |  |  |  |  | 11,462 |  |  |  |  | 11,462 |  | 11,462 |  |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
total assets |  | 140,914 |  |  |  |  | 122,136 |  |  |  |  | 140,914 |  | 122,136 |  | 119,680 |  |
Operating Segments [Member] | Mattress Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
current assets | [2] | 47,038 |  |  |  |  | 43,472 |  |  |  |  | 47,038 |  | 43,472 |  | 41,328 |  |
non-compete agreements, net |  | 828 |  |  |  |  | 903 |  |  |  |  | 828 |  | 903 |  | 979 |  |
customer relationships |  | 664 |  |  |  |  | 715 |  |  |  |  | 664 |  | 715 |  | 766 |  |
goodwill |  | 11,462 |  |  |  |  | 11,462 |  |  |  |  | 11,462 |  | 11,462 |  | 11,462 |  |
investment in unconsolidated joint venture |  | 1,106 |  |  |  |  |  |  |  |  |  | 1,106 |  |  |  |  |  |
property, plant and equipment |  | 48,916 | [3] |  |  |  | 37,480 | [4] |  |  |  | 48,916 | [3] | 37,480 | [4] | 33,773 | [5] |
total assets |  | 110,014 |  |  |  |  | 94,032 |  |  |  |  | 110,014 |  | 94,032 |  | 88,308 |  |
capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 17,689 |  | 9,666 |  | 10,454 |  |
depreciation expense |  |  |  |  |  |  |  |  |  |  |  | 6,245 |  | 5,837 |  | 5,034 |  |
Operating Segments [Member] | Upholstery Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
current assets | [2] | 29,021 |  |  |  |  | 26,540 |  |  |  |  | 29,021 |  | 26,540 |  | 29,905 |  |
property, plant and equipment |  | 1,879 | [6] |  |  |  | 1,564 | [7] |  |  |  | 1,879 | [6] | 1,564 | [7] | 1,467 | [8] |
total assets |  | 30,900 |  |  |  |  | 28,104 |  |  |  |  | 30,900 |  | 28,104 |  | 31,372 |  |
capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 822 |  | 626 |  | 468 |  |
depreciation expense |  |  |  |  |  |  |  |  |  |  |  | 840 |  | 834 |  | 739 |  |
Unallocated corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
cash and cash equivalents |  | 20,795 |  |  |  |  | 37,787 |  |  |  |  | 20,795 |  | 37,787 |  | 29,725 |  |
short-term investments |  | 2,443 |  |  |  |  | 4,359 |  |  |  |  | 2,443 |  | 4,359 |  | 10,004 |  |
income taxes receivable |  |  |  |  |  |  | 155 |  |  |  |  |  |  | 155 |  | 229 |  |
deferred income taxes |  | 419 |  |  |  |  | 2,319 |  |  |  |  | 419 |  | 2,319 |  | 5,169 |  |
other current assets |  | 2,894 |  |  |  |  | 2,477 |  |  |  |  | 2,894 |  | 2,477 |  | 2,440 |  |
property, plant and equipment | [9] | 856 |  |  |  |  | 929 |  |  |  |  | 856 |  | 929 |  | 838 |  |
long-term investments - held-to-maturity |  | 30,945 |  |  |  |  |  |  |  |  |  | 30,945 |  |  |  |  |  |
long-term investments - rabbi trust |  | 5,466 |  |  |  |  | 4,025 |  |  |  |  | 5,466 |  | 4,025 |  | 2,415 |  |
capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 260 |  | 416 |  | 252 |  |
other assets |  | $ 902 |  |  |  |  | $ 955 |  |  |  |  | $ 902 |  | $ 955 |  | $ 800 |  |
[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 $48.9 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.
[4] | 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.
[5] | The $33.8 million at May 3, 2015, represents property, plant, and equipment located in the U.S. of $23.8 million and located in Canada of $10.0 million.
[6] | 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.
[7] | 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.
[8] | The $1.5 million at May 3, 2015, represents property, plant, and equipment located in the U.S. of $848 and located in China of $619.
[9] | The $856, $929, and $838 balance at April 30, 2017, May 1, 2016, and May 3, 2015, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments.

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