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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, 2016
Apr. 30, 2015
Debt Instrument [Line Items]        
Loan agreement   $ 20,000,000    
Letters of credit     $ 6,500,000 $ 6,500,000
Loan agreement, Maturity date May 01, 2018 May 01, 2016    
Interest rate description     The borrowing rate under the Line of Credit at that date was 2.0%. 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     $ 12,200,000  
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Credit facility outstanding     4,200,000 4,200,000
Bank Guarantees [Member] | Letter of Credit [Member]        
Debt Instrument [Line Items]        
Credit facility outstanding     4,000,000  
Expiration Dates in Fiscal Year 2017 [Member] | Bank Guarantees [Member]        
Debt Instrument [Line Items]        
Bank Guarantees outstanding to customers     3,686,000  
Expiration Dates in Fiscal Year 2018 [Member] | Bank Guarantees [Member]        
Debt Instrument [Line Items]        
Bank Guarantees outstanding to customers     $ 478,000  
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    
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  
Term Loan B [Member] | November 3, 2014 [Member]        
Debt Instrument [Line Items]        
Fixed rate percentage     3.07%  
Term Loan B [Member] | Expiration Dates in Fiscal Year 2017 [Member]        
Debt Instrument [Line Items]        
Bank Guarantees outstanding to customers       41,000
Term Loan B [Member] | Expiration Dates in Fiscal Year 2016 [Member]        
Debt Instrument [Line Items]        
Bank Guarantees outstanding to customers       5,884,000
Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt, variable interest rate     1.50%  
Advances [Member]        
Debt Instrument [Line Items]        
Credit facility outstanding     $ 3,600,000 $ 4,600,000
Interest rate at period end     2.00% 1.75%
Secured Debt [Member]        
Debt Instrument [Line Items]        
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     $ 1,270,000