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Intangible Assets
 6 Months Ended
Nov. 30, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible Assets
 
The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows:
 
 
 
 
November 30, 2016
 
May 31, 2016
 
Useful Life
(Years)
 
Gross
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
5-12
 
$
82,463

 
$
(50,111
)
 
$
32,352

 
$
81,262

 
$
(47,747
)
 
$
33,515

Software/Technology
3-15
 
18,083

 
(12,504
)
 
5,579

 
17,539

 
(11,855
)
 
5,684

Covenants not to compete
2-5
 
11,148

 
(9,592
)
 
1,556

 
10,791

 
(9,290
)
 
1,501

Other
2-5
 
8,039

 
(5,389
)
 
2,650

 
7,827

 
(5,035
)
 
2,792

Total
 
 
$
119,733

 
$
(77,596
)
 
$
42,137

 
$
117,419

 
$
(73,927
)
 
$
43,492


 
Amortization expense for the three months ended November 30, 2016 and November 30, 2015 was $2.2 million and $2.4 million, respectively. Amortization expense for the six months ended November 30, 2016 and November 30, 2015 was $4.3 million and $4.8 million, respectively.