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Goodwill (Tables)
 6 Months Ended
Oct. 27, 2012
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 October 27, 2012 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
Total
Balance as of April 28, 2012:
$
2,435

 
$
741

 
$
171

 
$
3,347

Foreign currency translation
(5
)
 
(4
)
 
(2
)
 
(11
)
Balance as of October 27, 2012:
$
2,430

 
$
737

 
$
169

 
$
3,336