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Organization and Significant Accounting Policies - Accrued Sales Commission (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Self-Insurance Liability    
Estimated self-insurance liability of employee medical claim $ 1,181 $ 753
Other current liabilities    
Accrued liabilities    
Accrued sales commission $ 2,716 $ 2,842