Royalty Obligation - Additional Information (Detail) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 31, 2018	Apr. 27, 2024	Apr. 29, 2023	Jan. 31, 2024
Guaranteed Minimum Royalty Payments		$ 11,500,000
Royalty Obligation, Current		1,700,000		$ 1,700,000
Royalty Obligation Non Current		1,816,000		2,093,000
Accrued Royalties, Current, Excess Royalty Payment Due		572,000		935,000
Honeywell Asset Purchase and License Agreement [Member]
Payment Term Period	10 years
Minimum Royalty Payment Obligation	$ 15,000,000
Royalty Obligation, Current		1,500,000
Royalty Obligation Non Current		1,400,000
Excess Royalty Payments		500,000	$ 400,000
Accrued Royalties, Current, Excess Royalty Payment Due		900,000
Accrued Royalties Current Excess Royalty Payments Due		500,000
Royalty guarantee commitment amount due current		700,000		600,000
Royalty expense		300,000		$ 200,000
Honeywell Asset Purchase and License Agreement [Member] | Royalty Payments Due Remainder of Fiscal Year [Member]
Royalty guarantee commitement amount		100,000
Honeywell Asset Purchase and License Agreement [Member] | Royalty Payments Due In Next Twelve Months [Member]
Royalty guarantee commitement amount		200,000
Honeywell Asset Purchase and License Agreement [Member] | Royalty Payments Due Year Two [Member]
Royalty guarantee commitement amount		233,000
Honeywell Asset Purchase and License Agreement [Member] | Royalty Payments Due Year Three [Member]
Royalty guarantee commitement amount		233,000
Honeywell Asset Purchase and License Agreement [Member] | Royalty Payments Due Year Four [Member]
Royalty guarantee commitement amount		234,000
New Honeywell Asset Purchase and License Agreement [Member]
Excess Royalty Payments		$ 100,000