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Goodwill (Details)
$ in Thousands
 6 Months Ended
Oct. 31, 2015
USD ($)
Goodwill  
Balance as of May 2, 2015 $ 5,269
Acquisition, net of cash required 213
Foreign currency translation (111)
Balance as of October 31, 2015 5,371
Live Events  
Goodwill  
Balance as of May 2, 2015 2,321
Acquisition, net of cash required 0
Foreign currency translation (36)
Balance as of October 31, 2015 2,285
Commerical  
Goodwill  
Balance as of May 2, 2015 721
Acquisition, net of cash required 0
Foreign currency translation (2)
Balance as of October 31, 2015 719
Transportation  
Goodwill  
Balance as of May 2, 2015 91
Acquisition, net of cash required 0
Foreign currency translation (36)
Balance as of October 31, 2015 55
International  
Goodwill  
Balance as of May 2, 2015 2,136
Acquisition, net of cash required 213
Foreign currency translation (37)
Balance as of October 31, 2015 $ 2,312