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Goodwill (Tables)
 3 Months Ended
Jul. 27, 2013
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 27, 2013 were as follows: 
 
Live Events
 
Commercial
 
Transportation
 
International
 
Total
Balance as of April 27, 2013:
$
2,417

 
$
725

 
$
164

 
$
—

 
$
3,306

Acquisition, net of cash acquired
—

 
—

 
—

 
1,300

 
1,300

Foreign currency translation
(3
)
 
(1
)
 
(3
)
 
14

 
7

Balance as of July 27, 2013:
$
2,414

 
$
724

 
$
161

 
$
1,314

 
$
4,613