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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jul. 31, 2015
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, 2013
$
(45,420
)
Gain on foreign currency translation
26,428

Cumulative loss on foreign currency translation as of July 31, 2014
$
(18,992
)
Loss on foreign currency translation
(49,518
)
Cumulative loss on foreign currency translation as of July 31, 2015
$
(68,510
)
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,
 
2015
 
2014
 
2013
Expected life (in years)
5.3 – 7.2

 
5.1 – 7.1

 
5.2 – 6.9

Risk-free interest rate
1.58 – 2.26

 
1.55 – 2.3

 
0.61 – 1.5

Estimated volatility
22 – 28

 
20 – 25

 
24 – 26

Expected dividends
—
%
 
—
%
 
—
%
Weighted average fair value at measurement date
$
10.18

 
$
11.10

 
$
7.87