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Summary of Significant Accounting Policies - Change in Accrued Warranties Recorded as Non-Current Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]      
Beginning balance $ 1,243 $ 966 $ 786
Warranties issued and adjustments to provisions 1,853 1,569 1,419
Warranty claims (1,704) (1,292) (1,239)
Ending balance $ 1,392 $ 1,243 $ 966