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Organization and Significant Accounting Policies - Accrued Sales Commission (Details) - USD ($) |  | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Apr. 30, 2018 | Jan. 31, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Self-Insurance Liability |  |  |  |  |  |
Estimated self-insurance liability of employee medical claim |  |  |  | $ 753,000 | $ 965,000 |
Income Taxes |  |  |  |  |  |
U.S. federal statutory income tax rate (as a percent) | 35.00% | 21.00% | 35.00% | 21.00% | 21.00% | 30.40%
Deferred tax expense |  |  |  |  |  | $ 3,300,000
Other current liabilities |  |  |  |  |  |
Accrued liabilities |  |  |  |  |  |
Accrued sales commission |  |  |  | $ 2,842,000 | $ 1,301,000 |

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765 + Details
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- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer). + References No definition available. + Details
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