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Goodwill (Tables)
 9 Months Ended
Jan. 26, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill related to each reportable segment for the nine months ended January 26, 2019 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
(14
)
 
(99
)
 
(14
)
 
(169
)
 
(296
)
Balance as of January 26, 2019
$
2,281

 
$
3,245

 
$
53

 
$
2,389

 
$
7,968