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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
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 | $ 249 | $ 259 | $ 148
Additions (Reductions) Charged to Cost and Expenses | 323 | 72 | 169
Other | 0 | 0 | 78
Deductions | (100) | (82) | (136)
Balance at End of Year | 472 | 249 | 259
Reserve for Cash Discounts [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 1,451 | 1,627 | 979
Additions (Reductions) Charged to Cost and Expenses | 16,810 | 16,994 | 11,999
Other | 0 | 0 | 584
Deductions | (17,090) | (17,170) | (11,935)
Balance at End of Year | 1,171 | 1,451 | 1,627
Reserve for Sales Returns and Allowances [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 4,545 | 4,381 | 2,131
Additions (Reductions) Charged to Cost and Expenses | 17,049 | 11,867 | 11,318
Other | 0 | 0 | 1,829
Deductions | (17,053) | (11,703) | (10,897)
Balance at End of Year | $ 4,541 | $ 4,545 | $ 4,381

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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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