Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 29, 2017	Oct. 30, 2016	Oct. 29, 2017	Oct. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 80,698	$ 75,343	$ 160,230	$ 156,026
Gross profit	15,804	16,901	32,268	35,321
Selling, general, and administrative expenses	9,415	9,602	18,916	19,348
Income from operations	6,389	7,299	13,352	15,973
Interest expense	(37)		(37)
Interest income	128	15	259	40
Other expense	(321)	(155)	(674)	(307)
Income before income taxes	6,159	7,159	12,900	15,706
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	6,868	6,948	14,070	13,980
Income from operations	8,936	9,953	18,198	21,341
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	32,097	29,816	63,200	59,969
Gross profit	6,074	6,145	12,773	12,664
Selling, general, and administrative expenses	3,700	3,652	7,511	7,185
Income from operations	2,374	2,493	5,262	5,479
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	48,601	45,527	97,030	96,057
Gross profit	9,730	10,756	19,495	22,657
Selling, general, and administrative expenses	3,168	3,296	6,559	6,795
Income from operations	6,562	7,460	12,936	15,862
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	2,547	2,654	4,846	5,368
Income from operations	$ (2,547)	$ (2,654)	$ (4,846)	$ (5,368)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
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