Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 02, 2021	May 03, 2020	Apr. 28, 2019
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 299,720	$ 256,166	$ 281,325
Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	291,172	245,566	270,965
Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	8,548	10,600	10,360
Mattress Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	157,671	131,412	145,671
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	157,671	131,412	145,671
Upholstery Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	142,049	124,754	135,654
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	133,501	114,154	125,294
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 8,548	$ 10,600	$ 10,360