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Goodwill (Tables)
9 Months Ended
Jan. 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 nine months ended January 27, 2018 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
International
 
Total
Balance as of April 29, 2017
$
2,274

 
$
3,199

 
$
45

 
$
2,294

 
$
7,812

Foreign currency translation
38

 
258

 
38

 
323

 
657

Balance as of January 27, 2018
$
2,312

 
$
3,457

 
$
83

 
$
2,617

 
$
8,469