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Goodwill (Tables)
 9 Months Ended
Jan. 28, 2017
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 28, 2017 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
—

 
19

 
—

 
—

 
19

Foreign currency translation
(16
)
 
(108
)
 
(16
)
 
(129
)
 
(269
)
Balance as of January 28, 2017
$
2,288

 
$
3,261

 
$
59

 
$
2,258

 
$
7,866