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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) - USD ($)			12 Months Ended
	Jun. 03, 2015	May. 06, 2013	Apr. 30, 2015	Apr. 30, 2014
Debt Instrument [Line Items]
Loan agreement		$ 20,000,000
Letters of credit			$ 6,500,000	$ 4,700,000
Loan agreement, Maturity date		May 01, 2016
Interest rate description			The borrowing rate under the Line of Credit at that date was 1.75%. Monthly interest payments under the Line of Credit were payable at the Daily One Month LIBOR interest rate plus 1.5% per annum.
Unused and available credit facility			$ 11,200,000
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility outstanding				4,300,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility outstanding			4,200,000
Amended Loan Agreement [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Loan agreement, Maturity date	May 01, 2018
Bank Guarantees [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers			5,884,000	$ 41,000
Bank Guarantees [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility outstanding			$ 4,000,000
Term Loan A [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 3,450,000
Loan agreement, Maturity date		May 01, 2020
Term loan, Payment terms			Payments are due under Term Loan A in consecutive equal monthly principal payments in the amount of $17,000 until August 1, 2017, and then in consecutive equal monthly principal payments in the amount of $79,000 each, commencing on September 1, 2017 and continuing on the first business day of each month thereafter 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.
Term Loan A [Member] | August 1, 2017 [Member]
Debt Instrument [Line Items]
Periodic payments			$ 17,000
Fixed rate percentage			4.37%
Term Loan A [Member] | September 1, 2017 [Member]
Debt Instrument [Line Items]
Periodic payments			$ 79,000
Term Loan A [Member] | Interest Rate Swap Derivatives [Member] | August 1, 2017 [Member]
Debt Instrument [Line Items]
Fixed rate percentage			4.875%
Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility outstanding		$ 1,550,000
Loan agreement, Maturity date		May 01, 2020
Debt, variable interest rate			1.575%	1.73%
Periodic payments			$ 18,000
Term loan, Payment terms			Payments in the amount of $18,000 until May 1, 2020, and at that time, all principal
Bank Guarantees outstanding to customers			$ 1,784,000
Term Loan B [Member] | November 3, 2014 [Member]
Debt Instrument [Line Items]
Fixed rate percentage			3.07%
Term Loan B [Member] | 2016 [Member]
Debt Instrument [Line Items]
Bank Guarantees outstanding to customers			$ 576,000
Line of Credit [Member]
Debt Instrument [Line Items]
Debt, variable interest rate			1.50%
Advances [Member]
Debt Instrument [Line Items]
Credit facility outstanding			$ 4,600,000	$ 2,900,000
Interest rate at period end			1.75%	1.75%
Secured Debt [Member]
Debt Instrument [Line Items]
Principal payment for the year 2016			$ 421,000
Principal payment for the year 2017			421,000
Principal payment for the year 2018			915,000
Principal payment for the year 2019			1,164,000
Principal payment for the year 2020			$ 1,271,000

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

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