Lines of Credit - Narrative (Detail)			12 Months Ended
	Mar. 20, 2024 CNY (¥)	Jan. 19, 2023 USD ($)	Apr. 28, 2024 USD ($)	Apr. 30, 2023 USD ($)	May 01, 2022 USD ($)	Apr. 28, 2024 CNY (¥)	Apr. 28, 2023 USD ($)
Revolving Credit Facility [Member] | United States [Member]
Line Of Credit Facility [Line Items]
Applicable interest rate at end of period			6.81%	6.30%		6.81%
Reference rate on which the interest rate is based			SOFR
Line of credit facility, available borrowing			$ 18,500,000
Letters of credit, outstanding amount			535,000	$ 275,000
Outstanding amount			0	0
Interest paid during the year			$ 11,000	$ 8,000	$ 10,000
Revolving Credit Facility [Member] | United States [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity		$ 35,000,000
Expiration date		Jan. 19, 2026
Maximum amount of letters of credit		$ 1,000,000
Line of credit facility, accounts receivable, borrowing base percentage		85.00%
Line of credit facility, borrowing base percentage of eligible inventory value		65.00%
Line of credit facility, borrowing base percentage of net-orderly-liquidation value of eligible inventory value		85.00%
Line of credit facility, borrowing base percentage of eligible in-transit inventory value		65.00%
Line of credit facility, borrowing base percentage of net-orderly-liquidation value of eligible in-transit inventory value		85.00%
Line of credit facility, borrowing base eligible in-transit inventory value		$ 5,000,000
Line of credit facility, borrowing base percentage of eligible raw material inventory value		65.00%
Line of credit facility, borrowing base percentage of net-orderly-liquidation value of eligible raw material inventory value		85.00%
Line of credit stated amount to determine borrowing base		$ 22,500,000
Line of credit facility, equal to eligible accounts receivable, borrowing base percent		200.00%
Line of credit facility, commitment fee percentage		37.50%
Annual servicing fee		$ 12,000
Debt instrument, interest rate terms			The ABL Facility permits both base rate borrowings and borrowings based upon daily simple SOFR (the secured overnight financing rate administered by the Federal Reserve Bank of New York (or its successor)). Borrowings under the ABL Facility bear interest at an annual rate equal to daily simple SOFR plus 150 basis points (if the average monthly excess availability under the ABL Facility is greater than 50%) or 175 basis points (if the average monthly excess availability under the ABL Facility is less than or equal to 50%) or 50 basis points above base rate (if the average monthly excess availability under the ABL Facility is greater than 50%) or 75 basis points above base rate (if the average monthly excess availability under the ABL Facility is less than or equal to 50%), as applicable, with a fee on unutilized commitments at an annual rate of 37.5 basis points and an annual servicing fee of $12,000.
Threshold amount to determine excess borrowing availability		$ 35,000,000
Number of consecutive days in which if no event of default occurs, the compliance period ends		60 days
Line of credit facility, fixed charge ratio		1.1
Revolving Credit Facility [Member] | United States [Member] | Minimum [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, excess borrowing ability		$ 7,000,000
Line of credit facility, covenant, excess borrowing availability		$ 5,250,000
Revolving Credit Facility [Member] | United States [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on interest rate		150.00%
Revolving Credit Facility [Member] | United States [Member] | Minimum [Member] | Base Rate [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on interest rate		50.00%
Revolving Credit Facility [Member] | United States [Member] | Maximum [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, excess borrowing ability		$ 7,000,000
Line of credit facility, covenant, excess borrowing availability		$ 5,250,000
Revolving Credit Facility [Member] | United States [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on interest rate		175.00%
Revolving Credit Facility [Member] | United States [Member] | Maximum [Member] | Base Rate [Member] | ABL Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on interest rate		75.00%
Revolving Credit Facility [Member] | United States [Member] | Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Remaining letters of credit			$ 465,000
Revolving Credit Facility [Member] | China [Member]
Line Of Credit Facility [Line Items]
Applicable interest rate at end of period			(2.95%)			(2.95%)
Revolving credit agreements [Member] | United States [Member]
Line Of Credit Facility [Line Items]
Expiration date	Apr. 26, 2024
Revolving credit agreements [Member] | China [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	¥ 1,000,000		$ 4,000,000			¥ 29,000,000
Outstanding amount			0
Revolving credit agreements [Member] | China [Member] | Bank Of China [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 4,800,000			¥ 35,000,000
Expiration date			Oct. 24, 2024
Interest rate description			Interest charged under this agreement is based on an interest rate determined by the Chinese government at the time of borrowing
Revolving credit agreements [Member] | China [Member] | Chinese Yuan Renminbi [Member]
Line Of Credit Facility [Line Items]
Outstanding amount			$ 0				$ 0
Revolving credit agreements [Member] | China [Member] | Credit Agreement Expires March 7, 2025 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity | ¥	9,600,000
Revolving credit agreements [Member] | China [Member] | Credit Agreement Expires March 8, 2025 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity | ¥	9,700,000
Revolving credit agreements [Member] | China [Member] | Credit Agreement Expires March 9, 2025 [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity | ¥	¥ 9,700,000
Revolving credit agreements [Member] | China [Member] | Base Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on interest rate	50.00%