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Long-Lived Assets - Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 26, 2014
Goodwill  
Balance as of April 27, 2013: $ 3,306
Acquisition, net of cash acquired 1,250
Foreign currency translation 2
Balance as of April 26, 2014: 4,558
Live Events
  
Goodwill  
Balance as of April 27, 2013: 2,417
Acquisition, net of cash acquired 0
Foreign currency translation (36)
Balance as of April 26, 2014: 2,381
Commerical
  
Goodwill  
Balance as of April 27, 2013: 725
Acquisition, net of cash acquired 0
Foreign currency translation (2)
Balance as of April 26, 2014: 723
Transportation
  
Goodwill  
Balance as of April 27, 2013: 164
Acquisition, net of cash acquired 0
Foreign currency translation (35)
Balance as of April 26, 2014: 129
International
  
Goodwill  
Balance as of April 27, 2013: 0
Acquisition, net of cash acquired 1,250
Foreign currency translation 75
Balance as of April 26, 2014: $ 1,325