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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Inventory Disclosure [Abstract]    
Finished goods [1] $ 142,449 $ 108,247
Finished parts 39,236 36,181
Work in process 5,574 7,576
Raw material 14,277 11,766
Total inventories $ 201,536 $ 163,770
[1] The increase in finished goods inventory relates primarily to the Firearms segment.