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Segment Information - Statement of Operation for 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
Segment Reporting Information [Line Items]
net sales	$ 77,350	$ 76,169	$ 75,343	$ 80,682	$ 77,253	$ 78,466	$ 76,956	$ 80,185	$ 309,544	$ 312,860	$ 310,166
gross profit	17,156	16,759	16,901	18,419	16,613	16,563	15,733	16,202	69,235	65,111	55,567
selling, general, and administrative expenses	9,986	9,824	9,602	9,746	9,261	9,337	9,433	8,741	39,157	36,773	32,778
income from operations	7,170	6,935	7,299	8,673	7,352	7,226	6,300	7,461	30,078	28,338	22,789
interest expense								(24)			(64)
interest income	134	124	15	25	26	38	69	66	299	176	622
other expense	(305)	(69)	(155)	(152)	(211)	(85)	(225)	(95)	(681)	(616)	(391)
income before income taxes	$ 6,999	$ 6,990	$ 7,159	$ 8,546	$ 7,167	$ 7,179	$ 6,144	$ 7,408	29,696	27,898	22,956
Operating Segments [Member]
Segment Reporting Information [Line Items]
income from operations									40,471	37,794	29,799
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									118,739	126,441	130,427
gross profit									26,170	26,393	22,690
selling, general, and administrative expenses									15,079	15,094	14,562
income from operations									11,091	11,298	8,128
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
net sales									190,805	186,419	179,739
gross profit									43,065	38,718	32,877
selling, general, and administrative expenses									13,685	12,223	11,206
income from operations									29,380	26,496	21,671
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
selling, general, and administrative expenses									10,393	9,456	7,010
income from operations									$ (10,393)	$ (9,456)	$ (7,010)