Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jul. 31, 2016	Aug. 02, 2015	May 01, 2016		May 03, 2015
Segment Reporting Information [Line Items]
Non-compete agreement		$ 885	$ 960	$ 903
Customer relationships		702	753	715
Goodwill		11,462	11,462	11,462	[1]
Property, plant and equipment		41,745	37,480	39,973	[1]
Total assets		183,360	166,880	175,142	[1]
Cash and cash equivalents		45,549	25,933	37,787	[1]	$ 29,725
Short-term investments		2,434	6,336	4,359	[1]
Deferred income taxes		1,942	4,406	2,319	[1]
Income taxes receivable			142	155	[1]
Other current assets		2,294	3,502	2,477	[1]
Long-term investments		4,611	2,893	4,025	[1]
Other assets		2,502	2,475	2,573	[1]
Capital expenditures	[2]	3,543	2,960
Depreciation expense		1,761	1,555
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets		124,764	122,060	122,136
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Current assets	[3]	39,800	42,530	43,472
Non-compete agreement		885	960	903
Customer relationships		702	753	715
Goodwill		11,462	11,462	11,462
Property, plant and equipment	[4]	39,435	35,116	37,480
Total assets		92,284	90,821	94,032
Capital expenditures		3,521	2,704
Depreciation expense		1,556	1,359
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Current assets	[3]	31,021	29,721	26,540
Property, plant and equipment	[5]	1,459	1,518	1,564
Total assets		32,480	31,239	28,104
Capital expenditures		14	183
Depreciation expense		205	196
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment	[6]	851	846	929
Cash and cash equivalents		45,549	25,933	37,787
Short-term investments		2,434	6,336	4,359
Deferred income taxes		1,942	4,406	2,319
Income taxes receivable			142	155
Other current assets		2,294	3,502	2,477
Long-term investments		4,611	2,893	4,025
Other assets		915	762	$ 955
Capital expenditures		$ 8	$ 73

[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] Current assets represent accounts receivable and inventory for the respective segment.

[4] The $39.4 million at July 31, 2016, represents property, plant, and equipment of $25.5 million and $13.9 million located in the U.S. and Canada, respectively. The $35.1 million at August 2, 2015, represents property, plant, and equipment of $23.6 million and $11.5 million located in the U.S. and Canada, respectively. The $37.5 million at May 1, 2016, represents property, plant, and equipment of $24.8 million and $12.7 million located in the U.S. and Canada, respectively.

[5] The $1.5 million at July 31, 2016, represents property, plant, and equipment of $847 and $612 located in the U.S. and China, respectively. The $1.5 million at August 2, 2015, represents property, plant, and equipment of $818 and $700 located in the U.S. and China, respectively. The $1.6 million at May 1, 2016, represents property, plant, and equipment of $893 and $671 located in the U.S. and China, respectively.

[6] The $851, $846, and $929 at July 31, 2016, August 2, 2015 and May 1, 2016, 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.