Intangible Assets - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 30, 2022	Oct. 31, 2021	Oct. 30, 2022	May 01, 2022
Intangible Assets [Line Items]
Asset impairment charges			$ 0
Gross carrying amount of customer relationships	$ 3,100,000	$ 3,100,000	3,100,000	$ 3,100,000
Gross carrying amount of non-compete agreement	2,000,000.0	$ 2,000,000.0	2,000,000.0	2,000,000.0
Gross carrying amount of asset group	$ 38,800,000		38,800,000
Mattress Fabrics [Member]
Intangible Assets [Line Items]
Percentage of net sales	35.80%
Percentage of gross margin	(23.10%)	15.00%
Customer Relationships [Member]
Intangible Assets [Line Items]
Accumulated amortization	$ 1,600,000	$ 1,300,000	1,600,000	1,500,000
Remaining amortization expense for the fiscal year	151,000		151,000
Remaining amortization expense for the first fiscal year	301,000		301,000
Remaining amortization expense for the second fiscal year	301,000		301,000
Remaining amortization expense for the third fiscal year	301,000		301,000
Remaining amortization expense for the fourth fiscal year	279,000		279,000
Remaining amortization expense for the fiscal year thereafter	153,000		$ 153,000
Weighted average remaining amortization period			5 years 2 months 12 days
Customer Relationships [Member] | Minimum [Member]
Intangible Assets [Line Items]
Useful life			9 years
Customer Relationships [Member] | Maximum [Member]
Intangible Assets [Line Items]
Useful life			17 years
Customer Relationships [Member] | Mattress Fabrics [Member]
Intangible Assets [Line Items]
Gross carrying amount of customer relationships	383,000		$ 383,000
Non-Compete Agreement [Member]
Intangible Assets [Line Items]
Useful life			15 years
Accumulated amortization	1,600,000	$ 1,500,000	$ 1,600,000	$ 1,600,000
Remaining amortization expense for the fiscal year	37,000		37,000
Remaining amortization expense for the first fiscal year	76,000		76,000
Remaining amortization expense for the second fiscal year	76,000		76,000
Remaining amortization expense for the third fiscal year	76,000		76,000
Remaining amortization expense for the fourth fiscal year	76,000		76,000
Remaining amortization expense for the fiscal year thereafter	73,000		$ 73,000
Weighted average remaining amortization period			5 years 6 months
Non-Compete Agreement [Member] | Mattress Fabrics [Member]
Intangible Assets [Line Items]
Gross carrying amount of non-compete agreement	414,000		$ 414,000
Property, Plant and Equipment [Member]
Intangible Assets [Line Items]
Gross carrying amount of asset group	35,900,000		35,900,000
Right Of Use Assets [Member]
Intangible Assets [Line Items]
Gross carrying amount of asset group	$ 2,100,000		$ 2,100,000