Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Feb. 02, 2020	Jan. 31, 2021	Feb. 02, 2020
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 79,341	$ 68,518	$ 220,656	$ 208,787
Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	77,362	65,575	214,222	200,892
Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	1,979	2,943	6,434	7,895
Mattress Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	38,600	33,531	114,733	108,057
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	38,600	33,531	114,733	108,057
Upholstery Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	40,741	34,987	105,923	100,730
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	38,762	32,044	99,489	92,835
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 1,979	$ 2,943	$ 6,434	$ 7,895