Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 28, 2018	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017
Segment Reporting Information [Line Items]
Net sales	$ 85,310	$ 76,169	$ 245,541	$ 232,194
Gross profit	17,603	16,759	49,873	52,079
Selling, general, and administrative expenses	9,959	9,824	28,876	29,171
Income from operations	7,644	6,935	20,997	22,908
Interest expense	(31)		(69)
Interest income	132	124	391	164
Other expense	(229)	(69)	(903)	(376)
Income before income taxes	7,516	6,990	20,416	22,696
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	7,256	7,292	21,326	21,271
Income from operations	10,347	9,467	28,547	30,808
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	36,268	30,249	99,469	90,217
Gross profit	7,457	7,001	20,232	19,665
Selling, general, and administrative expenses	3,947	3,901	11,458	11,086
Income from operations	3,510	3,100	8,773	8,579
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	49,042	45,920	146,072	141,977
Gross profit	10,146	9,758	29,641	32,414
Selling, general, and administrative expenses	3,309	3,391	9,868	10,185
Income from operations	6,837	6,367	19,774	22,229
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	2,703	2,532	7,550	7,900
Income from operations	$ (2,703)	$ (2,532)	$ (7,550)	$ (7,900)

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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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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
-Paragraph 1
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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
-Name Accounting Standards Codification
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