Business Combination - Narrative (Detail) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 01, 2018	Jul. 31, 2019	May 31, 2018	May 03, 2020	May 03, 2020		Apr. 29, 2018
Business Acquisition [Line Items]
Goodwill asset impairments				$ 13,712,000	$ 13,712,000	[1]
Read Window Products, LLC [Member]
Business Acquisition [Line Items]
Purchase price	$ 5,700,000
Payment for acquisition	$ 4,500,000	$ 763,000	$ 375,000
Goodwill, statutory period deductible for income tax purposes					15 years
Goodwill asset impairments					$ 2,100,000
Contingent consideration arrangement, description					The Asset Agreement contains a contingent consideration arrangement that required us to pay a former shareholder of Read an earn-out payment based on adjusted EBITDA, as defined in the Asset Agreement, for calendar year 2018 in excess of fifty percent of a pre-established adjusted EBITDA.
Contingent consideration arrangement, basis for amount					Based on actual financial results in relation to the pre-established adjusted EBITDA target, a contingent payment was not required under the terms of the Asset Agreement, and therefore, no contingent liability has been recorded.
Revenue							$ 880,000
Net income (loss)							5,000
Read Window Products, LLC [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business acquisition costs							$ 339,000
Read Window Products, LLC [Member] | Minimum [Member] | Equipment [Member]
Business Acquisition [Line Items]
Property, plant and equipment, useful life					3 years
Read Window Products, LLC [Member] | Maximum [Member] | Equipment [Member]
Business Acquisition [Line Items]
Property, plant and equipment, useful life					10 years
Read Window Products, LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, useful life	9 years				9 years

[1] During fiscal 2020, we incurred asset impairment charges totaling $13.7 million, of which $13.6 million and $143,000 were associated with goodwill and a tradename associated Read, respectively. Of this $13.7 million, $11.5 million and $2.2 million pertained to the mattress fabrics segment and upholstery fabrics segment, respectively.