Maximum outstanding capacity for issuance of letters of credit under the credit facility.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Description of the frequency of the required periodic payments of interest, principal, or both, and the amount, if set, or a description of a formula upon which payment is based.

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The effective interest rate at the end of the reporting period.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of the required periodic payments of both interest and principal.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) - USD ($)			12 Months Ended
	Mar. 12, 2018	May 06, 2013	Apr. 30, 2018	Apr. 30, 2017
Debt Instrument [Line Items]
Loan agreement		$ 20,000,000
Letters of credit			$ 6,500,000
Loan agreement, Maturity date	Mar. 01, 2021	May 01, 2018
Interest rate description			The borrowing rate under the Line of Credit at that date was 3.50%. Monthly interest payments under the Line of Credit were payable at the Daily One Month LIBOR interest rate plus 1.50% per annum.
Unused and available credit facility			$ 11,000,000
Interest Rate Swap Derivatives [Member]
Debt Instrument [Line Items]
Fair value of interest rate swap derivatives			5,000	$ 62,000
Bank Guarantees [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility outstanding			5,000,000
Expiration Date Two Thousand And Nineteen [Member] \| Bank Guarantees [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers			1,625,000
Expiration Date Two Thousand And Twenty [Member] \| Bank Guarantees [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers			21,000
Expiration Date Two Thousand And Twenty One [Member] \| Bank Guarantees [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers			1,000
Expiration Date Two Thousand And Twenty Three [Member] \| Bank Guarantees [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers			63,000
Term Loan A [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 3,450,000
Loan agreement, Maturity date		May 01, 2020
Periodic payments			$ 79,000
Term loan, Payment terms			Payments are due under Term Loan A in consecutive equal monthly principal payments in the amount of $79,000 until May 1, 2020, and at that time, all principal, accrued unpaid interest and other charges outstanding under Term Loan A shall be due and payable in full.
Fixed rate percentage			4.37%
Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 1,550,000
Loan agreement, Maturity date		May 01, 2020
Periodic payments			$ 18,000
Term loan,Payment terms			$ 0	0
Term Loan B [Member] \| November Three Twenty Fourteen [Member]
Debt Instrument [Line Items]
Fixed rate percentage			3.07%
Term Loan B [Member] \| Expiration Date Two Thousand And Nineteen [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers				112,000
Term Loan B [Member] \| Expiration Date Two Thousand And Twenty [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers				117,000
Term Loan B [Member] \| Expiration Date Two Thousand And Eighteen [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers				1,403,000
Line of Credit [Member]
Debt Instrument [Line Items]
Debt, variable interest rate			1.50%
Advance Amount One [Member]
Debt Instrument [Line Items]
Credit facility outstanding			$ 3,800,000	3,500,000
Advance Amount Two [Member]
Debt Instrument [Line Items]
Credit facility outstanding			$ 5,200,000	$ 4,200,000
Advances [Member]
Debt Instrument [Line Items]
Interest rate at period end			3.50%	2.50%
Secured Debt [Member]
Debt Instrument [Line Items]
Principal payment for the year 2019			$ 1,167,000
Principal payment for the year 2020			1,167,000
Principal payment for the year 2021			$ 97,000