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Intangibles, Net
 12 Months Ended
Jul. 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangibles, Net
6 — Intangibles, Net

The following table sets forth amortizable intangible assets by major asset class:
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Net
Book Value
 
Weighted Average
Remaining Useful
Life (in years)
 
July 31,
 
July 31,
 
July 31,
 
July 31,
(In thousands, except remaining useful life)
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Amortized intangibles:
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Covenants not to compete
$
1,702

 
$
1,691

 
$
(1,235
)
 
$
(900
)
 
$
467

 
$
791

 
2
 
3
Supply contracts and customer relationships
26,471

 
27,506

 
(17,052
)
 
(13,551
)
 
9,419

 
13,955

 
3
 
4
Trade names
5,163

 
5,129

 
(3,423
)
 
(2,467
)
 
1,740

 
2,662

 
2
 
3
Licenses and databases
2,488

 
2,498

 
(2,353
)
 
(2,049
)
 
135

 
449

 
1
 
2
Intangibles, net
$
35,824

 
$
36,824

 
$
(24,063
)
 
$
(18,967
)
 
$
11,761

 
$
17,857

 
 
 
 

 
Aggregate amortization expense on intangible assets was $5.8 million, $6.8 million and $6.9 million for the years ended July 31, 2016, 2015 and 2014, respectively. Intangible amortization expense for the next five fiscal years based upon July 31, 2016 intangible assets is expected to be as follows:
(In thousands)
 
2017
$
5,428

2018
4,377

2019
832

2020
545

2021
265

Thereafter
314

Total future intangible amortization expense
$
11,761