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Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Allowance for doubtful accounts |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Beginning of Period | $ 598 |  | $ 680 |  | $ 722 |
Charged to Costs and Expenses | 1,000 |  | 1,319 |  | 5 | [1]
Charged to Other Accounts | 401 | [2] | 108 | [3] |  |
Deductions | (175) |  | (1,509) | [4] | (47) |
End of Period | 1,824 |  | 598 |  | 680 |
Deferred tax valuation allowance |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Beginning of Period | 2,792 |  | 2,561 |  | 2,621 |
Charged to Costs and Expenses | 544 |  | 231 |  | (60) |
End of Period | $ 3,336 |  | $ 2,792 |  | $ 2,561 |
[1] | Amount does not include $506,000 Charged to Costs and Expenses related to notes receivable.
[2] | Increase in fiscal 2018 valuation accounts represents acquired balances related to the Gemtech acquisition.
[3] | Increase in fiscal 2017 valuation accounts represents acquired balances related to the 2017 Acquisitions.
[4] | Decrease in fiscal 2017 valuation accounts primarily represents a write-off of one of our customers’ accounts receivable balances.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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