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Inventories (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018
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Inventory, Net [Abstract] |  |
Finished Goods | $ 33,736 | $ 36,503
Work-in-Process | 2,094 | 2,139
Paper and Other Materials | 373 | 550
Gross inventory | 36,203 | 39,192
Inventory Value of Estimated Sales Returns | 3,739 | 4,626
LIFO Reserve | (4,360) | (4,329)
Total Inventories | 35,582 | 39,489
Inventory obsolescence reserve | $ 15,800 | $ 18,200

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