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Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Nov. 01, 2020	Oct. 31, 2021	Nov. 01, 2020
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 74,561	$ 76,851	$ 157,608	$ 141,315
Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	72,298	74,696	153,646	136,860
Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	2,263	2,155	3,962	4,455
Mattress Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	40,883	40,030	83,941	76,133
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	40,883	40,030	83,941	76,133
Upholstery Fabrics [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	33,678	36,821	73,667	65,182
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	31,415	34,666	69,705	60,727
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Total Net Sales	$ 2,263	$ 2,155	$ 3,962	$ 4,455

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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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