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Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	May 01, 2022	May 02, 2021
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 234,934	$ 294,839	$ 299,720
Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	225,991	285,781	291,172
Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	8,943	9,058	8,548
Mattress Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	110,995	152,159	157,671
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	110,995	152,159	157,671
Upholstery Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	123,939	142,680	142,049
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	114,996	133,622	133,501
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 8,943	$ 9,058	$ 8,548

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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