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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Apr. 30, 2020
Inventory, Net [Abstract]    
Raw materials $ 51,500 $ 51,460
Work-in-process 50,007 42,381
Finished goods 41,247 32,572
Total FIFO inventories 142,754 126,413
Reserve to adjust inventories to LIFO value (15,039) (14,577)
Total inventories 127,715 111,836
Inventory carried under FIFO 78,000 66,000
Inventory carried under LIFO $ 49,700 $ 45,800