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Intangibles, Net
 12 Months Ended
Jul. 31, 2017
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)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Amortized intangibles:
 
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Covenants not to compete
 
$
1,702

 
$
1,702

 
$
(1,389
)
 
$
(1,235
)
 
$
313

 
$
467

 
1
 
2
Supply contracts and customer relationships
 
75,462

 
26,471

 
(22,248
)
 
(17,052
)
 
53,214

 
9,419

 
9
 
3
Trade names
 
23,859

 
5,163

 
(4,989
)
 
(3,423
)
 
18,870

 
1,740

 
2
 
2
Licenses and databases
 
5,385

 
2,488

 
(1,844
)
 
(2,353
)
 
3,541

 
135

 
3
 
1
Intangibles, net
 
$
106,408

 
$
35,824

 
$
(30,470
)
 
$
(24,063
)
 
$
75,938

 
$
11,761

 
 
 
 

 
Aggregate amortization expense on intangible assets was $6.8 million, $5.8 million and $6.8 million for the years ended July 31, 2017, 2016 and 2015, respectively. Intangible amortization expense for the next five fiscal years based upon July 31, 2017 intangible assets is expected to be as follows:
(In thousands)
 
 
2018
 
$
12,947

2019
 
9,249

2020
 
7,912

2021
 
6,043

2022
 
6,024

Thereafter
 
33,763

Total future intangible amortization expense
 
$
75,938