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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 27, 2013
Oct. 26, 2013
Goodwill    
Balance as of April 27, 2013: $ 3,306 $ 3,306
Acquisition, net of cash acquired 1,321 1,321
Foreign currency translation   55
Balance as of October 26, 2013:   4,682
Live Events
    
Goodwill    
Balance as of April 27, 2013: 2,417 2,417
Acquisition, net of cash acquired   0
Foreign currency translation   (8)
Balance as of October 26, 2013:   2,409
Commerical
    
Goodwill    
Balance as of April 27, 2013: 725 725
Acquisition, net of cash acquired   0
Foreign currency translation   0
Balance as of October 26, 2013:   725
Transportation
    
Goodwill    
Balance as of April 27, 2013: 164 164
Acquisition, net of cash acquired   0
Foreign currency translation   (8)
Balance as of October 26, 2013:   156
International
    
Goodwill    
Balance as of April 27, 2013: 0 0
Acquisition, net of cash acquired   1,321
Foreign currency translation   71
Balance as of October 26, 2013:   $ 1,392