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Income Taxes Reconciliation (Details) - USD ($)
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Income Taxes      
U.S. federal statutory income tax rate (as a percent) 21.00% 21.00% 21.00%
Foreign rate differential (as a percent) (0.50%) (0.10%) 4.90%
State and local income taxes, net of federal benefit (as a percent) 0.90% 0.20% 40.80%
R&D and other tax credits (7.80%) (1.80%) 23.00%
Valuation allowance (as a percent) 1.50% 1.10% (37.40%)
Return to provision adjustments (as a percent) 1.60%   (0.90%)
Limit on executive compensation 2.70% (0.40%) (2.40%)
Permanent items (as a percent) 0.60% (0.30%) (0.90%)
Uncertain tax position adjustment (as a percent) (0.60%) 2.00%  
Foreign derived intangible income (16.00%) 2.30%  
Excess benefit of equity awards (as a percent) (0.60%) 0.80% 5.20%
Goodwill impairment   (17.20%)  
Other (as a percent) 0.20% 0.20% 0.90%
Effective income tax rate (as a percent) 3.00% 7.80% 54.20%
Current:      
Federal $ 20,990,000 $ 1,510,000 $ (3,025,000)
State 1,511,000 1,474,000 165,000
Foreign (76,000) 2,273,000 279,000
Current 22,425,000 5,257,000 (2,581,000)
Deferred:      
Federal (18,844,000) (17,226,000) (5,764,000)
State (625,000) (1,488,000) 483,000
Foreign (1,065,000) (1,206,000) (2,507,000)
Deferred (20,534,000) (19,920,000) (7,788,000)
Total income tax (benefit) expense 1,891,000 (14,663,000) $ (10,369,000)
Deferred income tax assets:      
Accrued expenses 2,542,000 2,153,000  
Stock based compensation 3,391,000 2,380,000  
Allowances, reserves, and other 1,001,000 (1,032,000)  
Outside basis difference (33,000)    
Unrealized loss on securities 3,588,000 3,528,000  
Net operating loss and credit carry-forwards 19,800,000 20,430,000  
Capitalized research and development costs 42,788,000 24,962,000  
Reserve for inventory excess and obsolescence 5,577,000 3,185,000  
Lease liability 7,628,000 6,960,000  
Total deferred income tax assets 86,282,000 62,566,000  
Deferred income tax liabilities:      
Fixed asset basis (3,516,000) (4,999,000)  
Right of use assets (7,053,000) (6,478,000)  
Intangible basis (11,239,000) (3,109,000)  
Total deferred income tax liabilities (21,808,000) (14,586,000)  
Valuation allowance (23,835,000) (22,503,000)  
Net deferred tax assets $ 40,639,000 $ 25,477,000