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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 25, 2014
Goodwill  
Balance as of April 27, 2013: $ 3,306
Acquisition, net of cash acquired 1,271
Foreign currency translation (29)
Balance as of January 25, 2014: 4,548
Live Events
  
Goodwill  
Balance as of April 27, 2013: 2,417
Acquisition, net of cash acquired 0
Foreign currency translation (40)
Balance as of January 25, 2014: 2,377
Commerical
  
Goodwill  
Balance as of April 27, 2013: 725
Acquisition, net of cash acquired 0
Foreign currency translation (2)
Balance as of January 25, 2014: 723
Transportation
  
Goodwill  
Balance as of April 27, 2013: 164
Acquisition, net of cash acquired 0
Foreign currency translation (39)
Balance as of January 25, 2014: 125
International
  
Goodwill  
Balance as of April 27, 2013: 0
Acquisition, net of cash acquired 1,271
Foreign currency translation 52
Balance as of January 25, 2014: $ 1,323