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Inventories (Details) - USD ($) $ in Thousands | Jul. 31, 2018 | Apr. 30, 2018
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Inventories [Abstract] |  |
Finished goods | $ 33,388 | $ 36,503
Work-in-process | 2,414 | 2,139
Paper and other materials | 696 | 550
Gross inventory | 36,498 | 39,192
Inventory value of estimated sales returns | 4,478 | 4,626
LIFO reserve | (4,404) | (4,329)
Total inventories | $ 36,572 | $ 39,489

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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