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Inventories (Details) - USD ($) $ in Thousands | Oct. 31, 2017 | Apr. 30, 2017 | Oct. 31, 2016
--- | --- | --- | ---
Inventories [Abstract] |  |  |
Finished goods | $ 35,217 | $ 38,329 | $ 42,063
Work-in-process | 3,427 | 7,078 | 5,055
Paper and other materials | 517 | 650 | 3,557
Gross inventory | 39,161 | 46,057 | 50,675
Inventory value of estimated sales returns | 7,461 | 4,727 | 6,028
LIFO reserve | (3,082) | (2,932) | (4,924)
Total inventories | $ 43,540 | $ 47,852 | $ 51,779

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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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