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Revenue Recognition and Contracts with Customers - Schedule of Outstanding Performance Obligations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Disaggregation Of Revenue [Line Items]    
Revenue recognized $ 15,000 $ 48,600
Revenue deferred 3,100 51,100
ASU 2014-09    
Disaggregation Of Revenue [Line Items]    
Outstanding performance obligations at beginning of period 14,744 12,213
Revenue recognized (14,957) (48,576)
Revenue deferred 3,120 51,107
Outstanding performance obligations at end of period $ 2,907 $ 14,744