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Goodwill
 12 Months Ended
May 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
 
The changes in the carrying amount of goodwill by segment is shown below:
 
Services
 
International
 
Products
 
Total
Balance at May 31, 2014
$
73,767

 
$
43,552

 
$
13,197

 
$
130,516

Goodwill acquired during the year
41,986

 
1,480

 
—

 
43,466

Adjustments to preliminary purchase price allocations
3,529

 
(367
)
 
—

 
3,162

Foreign currency translation
(2,003
)
 
(8,727
)
 
—

 
(10,730
)
Balance at May 31, 2015
$
117,279

 
$
35,938

 
$
13,197

 
$
166,414

Goodwill acquired (disposed) during the year
2,728

 
(374
)
 
—

 
2,354

Adjustments to preliminary purchase price allocations
270

 
—

 
—

 
270

Foreign currency translation
(594
)
 
776

 
—

 
182

Balance at May 31, 2016
$
119,683

 
$
36,340

 
$
13,197

 
$
169,220


 
The Company reviews goodwill for impairment on a reporting unit basis on March 1 of each year and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. As of May 31, 2016, the Company did not identify any changes in circumstances that would indicate the carrying value of goodwill may not be recoverable.

The Company's cumulative goodwill impairment as of May 31, 2016, May 31, 2015 and May 31, 2014 was $9.9 million, which is within its International segment.