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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2021
Apr. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 28,419 $ 21,528
Finished parts 53,289 41,738
Work in process 6,878 7,918
Raw material 8,554 7,293
Total inventories $ 97,140 $ 78,477