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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Apr. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of aggregate amortization expense on intangible assets
The following table sets forth amortizable intangible assets by major asset class:
(In thousands)
 
April 30, 2018
 
July 31, 2017
Amortized intangibles:
 
 
 
 
Covenants not to compete
 
$
1,679

 
$
1,702

Supply contracts & customer relationships
 
76,162

 
75,462

Trade name
 
24,257

 
23,859

Licenses and databases
 
9,458

 
5,385

Accumulated amortization
 
(42,174
)
 
(30,470
)
Net intangibles
 
$
69,382

 
$
75,938
Schedule of change in carrying amount of goodwill (in thousands)
The change in the carrying amount of goodwill was as follows (in thousands):
Balance as of July 31, 2017
 
$
340,243

Goodwill adjustments and acquisitions during the period
 
(377
)
Effect of foreign currency exchange rates
 
2,593

Balance as of April 30, 2018
 
$
342,459