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Fair Value Measurements - Reconciliation (Details) - Significant unobservable inputs (Level 3)
$ in Thousands
3 Months Ended
Jul. 31, 2021
USD ($)
Reconciliation between beginning and ending balances of items measured at fair value on recurring basis  
Balance at the beginning of the period $ 5,521
Business acquisition $ 889
Included in selling, general and administrative us-gaap:SellingGeneralAndAdministrativeExpenses
Balance at the end of the period $ 6,475