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Inventories (Details) - USD ($) $ in Thousands | Jan. 31, 2018 | Apr. 30, 2017
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Inventories [Abstract] |  |
Finished goods | $ 35,822 | $ 38,329
Work-in-process | 3,292 | 7,078
Paper and other materials | 626 | 650
Gross inventory | 39,740 | 46,057
Inventory value of estimated sales returns | 7,217 | 4,727
LIFO reserve | (3,157) | (2,932)
Total inventories | $ 43,800 | $ 47,852

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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://www.xbrl.org/2003/role/presentationRef -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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