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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Allowance for doubtful accounts |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | $ 1,190 | $ 1,041 | $ 1,080
Charged to Cost and Expenses | 82 | 219 | 198
Deductions | (677) | (70) | (237)
Balance at End of Period | 595 | 1,190 | 1,041
Warranty reserve |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 2,015 | 1,704 | 2,090
Charged to Cost and Expenses | 1,650 | 2,069 | 702
Deductions | (1,324) | (1,758) | (1,088)
Balance at End of Period | 2,341 | 2,015 | 1,704
Reserve for inventory excess and obsolescence |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 10,232 | 7,824 | 3,953
Balance Acquired from Acquisition | 1,415 |  |
Charged to Cost and Expenses | 1,178 | 5,377 | 5,054
Deductions | (2,536) | (2,969) | (1,183)
Balance at End of Period | 10,289 | 10,232 | 7,824
Reserve for self-insured medical claims |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 753 | 944 | 1,003
Charged to Cost and Expenses | 11,329 | 13,031 | 10,808
Deductions | (10,789) | (13,222) | (10,867)
Balance at End of Period | $ 1,293 | $ 753 | $ 944

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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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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