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Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 30, 2022	Jan. 31, 2021	Jan. 30, 2022	Jan. 31, 2021
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 80,291	$ 79,341	$ 237,899	$ 220,656
Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	77,839	77,362	231,485	214,222
Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	2,452	1,979	6,414	6,434
Mattress Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	38,439	38,600	122,380	114,733
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	38,439	38,600	122,380	114,733
Upholstery Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	41,852	40,741	115,519	105,923
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	39,400	38,762	109,105	99,489
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 2,452	$ 1,979	$ 6,414	$ 6,434

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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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