Customer Financing - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 26, 2024	Oct. 28, 2023	Oct. 26, 2024	Oct. 28, 2023	Apr. 27, 2024
Customer Financing [Line Items]
Maximum credit financed for equipment purchases for any one customer	$ 2,000,000		$ 2,000,000
Financing contracts sold			108,672,000	$ 115,266,000
(Loss) gain on sale of financing contracts	(3,876,000)	$ (3,736,000)	7,385,000	7,160,000
Proceeds from receivables sold			168,139,000	141,353,000
Unamortized discount	3,011,000		3,011,000		$ 3,097,000
Cash and cash equivalents	157,935,000		157,935,000		114,462,000
Current receivables of finance contracts not yet sold	56,297,000		56,297,000		74,430,000
Finance contracts receivable sold and outstanding	539,182,000		$ 539,182,000
Bad debt write-offs, percentage (less than)			1.00%
Unsettled Financing Arrangements
Customer Financing [Line Items]
Cash and cash equivalents	31,149,000		$ 31,149,000		$ 33,813,000
Customer Finance Contracts
Customer Financing [Line Items]
Servicing asset	0		0
Servicing liability	0		0
(Loss) gain on sale of financing contracts	(3,164,000)	$ 3,953,000	$ 9,845,000	$ (12,880,000)
MUFG
Customer Financing [Line Items]
Percentage of principal amount of financing contracts held as collateral (at least)			15.00%
Capacity under agreement	$ 525,000,000		$ 525,000,000