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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jul. 31, 2017
Accounting Policies [Abstract]  
Schedule of foreign currency translation
The cumulative effects of foreign currency exchange rate fluctuations were as follows (in thousands):
Cumulative loss on foreign currency translation as of July 31, 2015
 
$
(68,510
)
Loss on foreign currency translation
 
(40,684
)
Cumulative loss on foreign currency translation as of July 31, 2016
 
$
(109,194
)
Gain on foreign currency translation
 
8,518

Cumulative loss on foreign currency translation as of July 31, 2017
 
$
(100,676
)
Schedule of fair value assumptions
The fair value of each option was estimated on the measurement date using the Black-Scholes Merton (BSM) option-pricing model utilizing the following assumptions:
 
 
July 31,
 
 
2017
 
2016
 
2015
Expected life (in years)
 
5.5 – 7.4

 
5.3 – 7.2

 
5.3 – 7.2

Risk-free interest rate
 
1.20 – 2.07

 
1.16 – 2.06

 
1.58 – 2.26

Estimated volatility
 
20 – 23

 
21 – 26

 
22 – 28

Expected dividends
 
—
%
 
—
%
 
—
%
Weighted average fair value at measurement date
 
$
7.05

 
$
5.04

 
$
5.09