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Commitments and Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended
	Jan. 31, 2016	Apr. 30, 2015	May. 05, 2014
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve in non-current liabilities	$ 675,000	$ 675,000
Amount placed in escrow			$ 3,000,000
Escrow deposit, remaining amount			$ 250,000
General and Administrative Expense
Schedule Of Commitments And Contingencies [Line Items]
Insurance recovery as a result of an insurance settlement agreement	1,800,000
Minimum
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought	75,000
Maximum
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought	$ 1,500,000

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Schedule of commitments and contingencies.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

+ References

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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