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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 259 | $ 148 | $ 171
Additions (Reductions) Charged to Cost and Expenses | 72 | 169 | 200
Other | 0 | 0 | 0
Deductions | (82) | (136) | (223)
Balance at End of Year | 249 | 259 | 148
Reserve for Cash Discounts [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 1,627 | 979 | 827
Additions (Reductions) Charged to Cost and Expenses | 16,994 | 11,999 | 10,027
Other | 0 | 1 | 0
Deductions | (17,170) | (11,935) | (9,875)
Balance at End of Year | 1,451 | 1,627 | 979
Reserve for Sales Returns and Allowances [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 4,381 | 2,131 | 1,782
Additions (Reductions) Charged to Cost and Expenses | 11,867 | 11,318 | 7,962
Other | 0 | 2 | 0
Deductions | (11,703) | (10,897) | (7,613)
Balance at End of Year | $ 4,545 | $ 4,381 | $ 2,131

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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