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Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Oct. 31, 2020
Apr. 30, 2020
Revenue from Contract with Customer [Abstract]    
Contract assets $ 8,650 $ 6,131
Contract liabilities $ 2,768 $ 2,508
Contract liability recognized as revenue percentage 100.00% 100.00%