Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Aug. 02, 2015
Segment Reporting Information [Line Items]
Net sales	$ 80,682	$ 80,185
Gross profit	18,419	16,202
Selling, general, and administrative expenses	9,746	8,741
income from operations	8,673	7,461
Interest expense		(24)
Interest income	25	66
Other expense	(152)	(95)
Income before income taxes	8,546	7,408
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	7,033	6,518
income from operations	11,386	9,684
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	50,530	47,808
Gross profit	11,901	9,925
Selling, general, and administrative expenses	3,499	2,923
income from operations	8,402	7,003
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	30,152	32,377
Gross profit	6,518	6,277
Selling, general, and administrative expenses	3,534	3,595
income from operations	2,984	2,681
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	2,713	2,223
income from operations	$ (2,713)	$ (2,223)