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Goodwill (Tables)
 6 Months Ended
Oct. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill related to each reportable segment for the six months ended October 31, 2015 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
International
 
Total
Balance as of May 2, 2015
$
2,321

 
$
721

 
$
91

 
$
2,136

 
$
5,269

Acquisition, net of cash required
—

 
—

 
—

 
213

 
213

Foreign currency translation
(36
)
 
(2
)
 
(36
)
 
(37
)
 
(111
)
Balance as of October 31, 2015
$
2,285

 
$
719

 
$
55

 
$
2,312

 
$
5,371