Segment Information - Balance Sheet Information by Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 27, 2013		Apr. 28, 2013		Oct. 28, 2012		Apr. 29, 2012
Segment Reporting Information [Line Items]
Customer relationships	$ 842
Goodwill	11,462		11,462	[1]	11,462
Property, plant and equipment	30,559		30,594	[1]	30,621
Total assets	156,242		144,706	[1]	142,443
Cash and cash equivalents	24,267		23,530	[1]	23,464		25,023
Short-term investments	6,220		5,286	[1]	5,241
Income taxes receivable			318	[1]
Other current assets	2,550		2,093	[1]	1,640
Other assets	2,959		1,151	[1]	1,868
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	113,097		103,265		100,425
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Current assets	37,372	[2]	33,323	[2]	33,553	[2]
Non-compete agreement	1,055		185		259
Customer relationships	842
Goodwill	11,462		11,462		11,462
Property, plant and equipment	28,307	[3]	28,578	[3]	28,737	[3]
Total assets	79,038		73,548		74,011
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Current assets	32,447	[2]	28,487	[2]	25,386	[2]
Property, plant and equipment	1,612	[4]	1,230	[4]	1,028	[4]
Total assets	34,059		29,717		26,414
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment	640	[5]	786	[5]	856	[5]
Cash and cash equivalents	24,267		23,530		23,464
Short-term investments	6,220		5,286		5,241
Deferred income taxes	8,406		8,462		9,208
Income taxes receivable			318
Other current assets	2,550		2,093		1,640
Other assets	$ 1,062		$ 966		$ 1,609

[1] Derived from audited financial statements.

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

[3] The $28.3 million at October 27, 2013, represents property, plant, and equipment of $20.5 million and $7.8 million located in the U.S. and Canada, respectively. The $28.7 million at October 28, 2012, represents property, plant, and equipment of $21.2 million and $7.5 million located in the U.S. and Canada, respectively. The $28.6 million at April 28, 2013, represents property, plant, and equipment of $20.4 million and $8.2 million located in the U.S. and Canada, respectively.

[4] The $1.6 million at October 27, 2013, represents property, plant, and equipment located in the U.S. of $1.1 million, located in China of $464, and located in Poland of $49. The $1.0 million at October 28, 2012, represents property, plant, and equipment located in the U.S. of $776, located in China of $160, and located in Poland of $92. The $1.2 million at April 28, 2013, represents property, plant, and equipment located in the U.S. of $908, located in China of $265, and located in Poland of $57.

[5] The $640, $856, and $786 at October 27, 2013, October 28, 2012, and April 28, 2013, 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.