Inventories - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 30, 2022	Oct. 31, 2021	Oct. 30, 2022	Oct. 31, 2021
Inventory [Line Items]
Non-cash inventory charge	$ 5,300,000		$ 6,400,000
Write down to net realizable value			6,439,000	$ 579,000
Exit of Cut and Sew Upholstery Fabrics Operation [Member] | Shanghai, China [Member]
Inventory [Line Items]
Loss on disposal	(98,000)		(98,000)
Mattress Fabrics [Member]
Inventory [Line Items]
Non-cash inventory charge	3,800,000		4,200,000
Write down to net realizable value	$ 2,900,000		2,900,000
Percentage of net sales	35.80%
Percentage of gross margin	(8.70%)	15.00%
Upholstery Fabrics [Member]
Inventory [Line Items]
Non-cash inventory charge	$ 1,500,000		2,200,000
Upholstery Fabrics [Member] | Shanghai, China [Member]
Inventory [Line Items]
Loss on disposal	(98,000)		(98,000)
Mattress and Upholstery Fabrics [Member]
Inventory [Line Items]
Non-cash inventory charge	$ 2,300,000	$ 226,000	$ 3,400,000	$ 579,000