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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Apr. 30, 2020
Income Tax Contingency [Line Items]          
Income tax expense (benefit) $ (813) $ (350) $ (989) $ 1,822  
Effective income tax rate 113.20% 15.50% 59.30% 104.50%  
Deferred tax liability, global tax exposure for unremitted earnings of international subsidiaries $ 647   $ 647   $ 785
Income tax receivable 4,205   4,205   $ 2,717
Kewaunee Labway India | Ministry of Finance, India          
Income Tax Contingency [Line Items]          
Dividend distribution tax withholding $ 18 $ 50 $ 99 $ 2,214  
Kewaunee Labway India | Ministry of Finance, India | U.S. government          
Income Tax Contingency [Line Items]          
Effective income tax rate     10.00%    
Kewaunee Labway India | Ministry of Finance, India | Singapore government          
Income Tax Contingency [Line Items]          
Effective income tax rate     15.00%