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Income Taxes - Income Tax Expense (Detail) - USD ($)
 12 Months Ended
Apr. 27, 2025
Apr. 28, 2024
Apr. 30, 2023
current      
federal $ 0 $ 0 $ 0
state 4,000 0 1,000
foreign 2,199,000 2,584,000 3,053,000
uncertain income tax positions (468,000) 78,000 78,000
current income tax expense 1,735,000 2,662,000 3,132,000
deferred      
federal (161,000) 1,342,000 (1,591,000)
state (9,000) 63,000 (66,000)
undistributed earnings – foreign subsidiaries 316,000 627,000 628,000
U.S. federal & state carryforwards and credits (4,130,000) (4,734,000) (5,162,000)
foreign (1,658,000) (240,000) (629,000)
valuation allowance 4,299,000 3,329,000 6,818,000
deferred income tax expense (1,343,000) 387,000 (2,000)
income tax expense $ 392,000 $ 3,049,000 $ 3,130,000