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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Allowance for doubtful accounts |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | $ 1,041 | $ 1,080 | $ 104
Charged to Cost and Expenses | 219 | 198 | 976
Deductions | (70) | (237) |
Balance at End of Period | 1,190 | 1,041 | 1,080
Warranty reserve |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 1,704 | 2,090 | 1,947
Charged to Cost and Expenses | 2,069 | 702 | 1,884
Deductions | (1,758) | (1,088) | (1,741)
Balance at End of Period | 2,015 | 1,704 | 2,090
Reserve for inventory excess and obsolescence |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 7,824 | 3,953 | 2,756
Charged to Cost and Expenses | 5,377 | 5,054 | 2,758
Deductions | (2,969) | (1,183) | (1,561)
Balance at End of Period | 10,232 | 7,824 | 3,953
Reserve for self-insured medical claims |  |  |
Movement in valuation and qualifying accounts and reserves |  |  |
Balance at Beginning of Period | 944 | 1,003 | 1,133
Charged to Cost and Expenses | 13,031 | 10,808 | 9,100
Deductions | (13,222) | (10,867) | (9,230)
Balance at End of Period | $ 753 | $ 944 | $ 1,003

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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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