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Segments -Reconciliation from adjusted income from operations to income (loss) before taxes (Details) - USD ($)
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Segments      
Selling, general and administrative $ 158,753,000 $ 114,420,000 $ 131,905,000
Research and development 100,729,000 97,687,000 64,255,000
Impairment of goodwill 18,359,000 156,017,000 156,017,000
Interest expense, net (2,188,000) (4,220,000) (9,368,000)
Other income (expense), net 1,057,000 (4,373,000) (346,000)
Income (loss) before income taxes 44,501,000 61,557,000 (190,830,000)
Product segments      
Segments      
Segment adjusted gross margin 338,041,000 297,479,000 187,520,000
Intangible amortization included in cost of sales 19,405,000 13,548,000 14,006,000
Selling, general and administrative 158,753,000 114,420,000 131,905,000
Research and development 100,729,000 97,687,000 64,255,000
Impairment of goodwill 18,359,000   156,017,000
Interest expense, net (2,188,000) (4,220,000) (9,368,000)
Other income (expense), net 1,057,000 (4,373,000) (346,000)
Income (loss) before income taxes $ 39,664,000 $ 63,231,000 $ (188,377,000)