Customer Financing - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 25, 2025	Jan. 27, 2024	Jan. 25, 2025	Jan. 27, 2024	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			193,443,000	$ 197,712,000
(Loss) gain on sale of financing contracts	(2,701,000)	$ (3,110,000)	10,086,000	10,270,000
Proceeds from receivables sold			248,951,000	211,827,000
Unamortized discount	2,178,000		2,178,000		$ 3,097,000
Cash and cash equivalents	134,996,000		134,996,000		114,462,000
Current receivables of finance contracts not yet sold	48,586,000		48,586,000		74,430,000
Finance contracts receivable sold and outstanding	553,111,000		$ 553,111,000
Bad debt write-offs, percentage (less than)			1.00%
Unsettled Financing Arrangements
Customer Financing [Line Items]
Cash and cash equivalents	32,360,000		$ 32,360,000		$ 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	2,058,000	$ (9,117,000)	$ 7,787,000	$ (3,763,000)
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