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Goodwill (Tables)
 3 Months Ended
Jul. 28, 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 three months ended July 28, 2012 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
Total
Balance as of April 28, 2012:
$
2,435

 
$
741

 
$
171

 
$
3,347

Foreign currency translation
(14
)
 
(12
)
 
(5
)
 
(31
)
Balance as of July 28, 2012:
$
2,421

 
$
729

 
$
166

 
$
3,316