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Goodwill (Tables)
 6 Months Ended
Oct. 27, 2018
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 27, 2018 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
International
 
Total
Balance as of April 28, 2018
$
2,295

 
$
3,344

 
$
67

 
$
2,558

 
$
8,264

Foreign currency translation
(6
)
 
(40
)
 
(6
)
 
(159
)
 
(211
)
Balance as of October 27, 2018
$
2,289

 
$
3,304

 
$
61

 
$
2,399

 
$
8,053