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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).

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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).

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Amount of reasonable estimate for income tax expense (benefit) for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act.

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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