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Goodwill (Tables)
 6 Months Ended
Nov. 01, 2014
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 November 1, 2014 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
—

 
—

 
—

 
1,099

 
1,099

Foreign currency translation
(6
)
 
—

 
(7
)
 
(181
)
 
(194
)
Balance as of November 1, 2014
$
2,353

 
$
723

 
$
122

 
$
2,243

 
$
5,441