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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) (USD $)
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Apr. 30, 2013
Standby letters of credit [Member]
Apr. 30, 2013
Revolving Credit Facility [Member]
Jul. 31, 2009
Revolving Credit Facility [Member]
Apr. 30, 2013
Revolving Credit Facility [Member]
Minimum [Member]
Apr. 30, 2013
Revolving Credit Facility [Member]
Maximum [Member]
Apr. 30, 2013
Revolving credit facility outstanding [Member]
Apr. 30, 2013
Letter of credit [Member]
Bank guarantees outstanding [Member]
Aug. 02, 2010
Secured debt [Member]
Apr. 30, 2013
Secured debt [Member]
Aug. 02, 2012
Secured debt [Member]
Proforma Debt Instrument [Line Items]                    
Credit facility outstanding $ 2,100,000 $ 15,000,000 $ 2,000,000     $ 6,700,000   $ 4,000,000    
Credit facility expiration date   Jul. 31, 2014         Apr. 30, 2013      
Line of credit facility, Interest rate description   Monthly interest payments under the facility are payable calculated at the 30-day LIBOR Market Interest Rate plus a variable rate                
Debt, variable interest rate   1.575%   1.575% 2.175%       1.575%  
Interest rate at period end   1.773%                
Term loan duration               7 years    
Term loan principal payments                 17,000  
Line of credit facility, interest rate description                 Interest calculated at the 30-day LIBOR Market Index Rate  
Interest rate swap, conversion rate                   4.875%
Principal payment for the year 2014                 200,000  
Principal payment for the year 2015                 200,000  
Principal payment for the year 2016                 200,000  
Principal payment for the year 2017                 200,000  
Principal payment for the year 2018                 $ 2,667,000