Segment Information - Financial Information for Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 27, 2013	Oct. 28, 2012	Oct. 27, 2013	Oct. 28, 2012
Segment Reporting Information [Line Items]
Net sales	$ 70,589	$ 65,560	$ 140,730	$ 134,744
Gross profit	12,235	11,877	25,308	24,998
Selling, general, and administrative expenses	7,200	7,209	14,299	14,850
Income from operations	5,035	4,668	11,009	10,148
Interest expense	(99)	(156)	(239)	(346)
Interest income	102	96	195	222
Other expense	(224)	(76)	(616)	(121)
Income before income taxes	4,814	4,532	10,349	9,903
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	5,790	5,581	11,430	11,312
Income from operations	6,445	6,296	13,878	13,686
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	40,331	39,697	78,494	77,662
Gross profit	7,322	7,539	14,713	15,161
Selling, general, and administrative expenses	2,620	2,424	4,994	4,814
Income from operations	4,702	5,115	9,719	10,347
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	30,258	25,863	62,236	57,082
Gross profit	4,913	4,338	10,595	9,837
Selling, general, and administrative expenses	3,170	3,157	6,436	6,498
Income from operations	1,743	1,181	4,159	3,339
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	1,410	1,628	2,869	3,538
Income from operations	$ (1,410)	$ (1,628)	$ (2,869)	$ (3,538)