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Goodwill (Tables)
 9 Months Ended
Jan. 31, 2015
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 31, 2015 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
International
 
Total
Balance as of April 26, 2014
$
2,381

 
$
723

 
$
129

 
$
1,325

 
$
4,558

Disposal of automated rigging systems for theatre applications
(22
)
 
—

 
—

 
—

 
(22
)
Acquisition, net of cash required
—

 
—

 
—

 
1,244

 
1,244

Foreign currency translation
(55
)
 
(3
)
 
(54
)
 
(414
)
 
(526
)
Balance as of January 31, 2015
$
2,304

 
$
720

 
$
75

 
$
2,155

 
$
5,254