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Goodwill (Tables)
 6 Months Ended
Oct. 29, 2016
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 29, 2016 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
International
 
Total
Balance as of April 30, 2016
$
2,304

 
$
3,350

 
$
75

 
$
2,387

 
$
8,116

Acquisition, net of cash required
—

 
(103
)
 
—

 
—

 
(103
)
Foreign currency translation
(24
)
 
(163
)
 
(24
)
 
(90
)
 
(301
)
Balance as of October 29, 2016
$
2,280

 
$
3,084

 
$
51

 
$
2,297

 
$
7,712