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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jul. 31, 2019
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, 2017
 
$
(100,676
)
Loss on foreign currency translation
 
(7,252
)
Cumulative loss on foreign currency translation as of July 31, 2018
 
$
(107,928
)
Loss on foreign currency translation
 
(24,601
)
Cumulative loss on foreign currency translation as of July 31, 2019
 
$
(132,529
)
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,
 
 
2019
 
2018
 
2017
Expected life (in years)
 
5.3 – 6.6

 
5.3 – 6.9

 
5.5 – 7.4

Risk-free interest rate
 
1.80 – 2.69

 
1.88 – 2.62

 
1.20 – 2.07

Estimated volatility
 
21.6 – 22.1

 
19.7 – 20.7

 
20.0 – 22.7

Expected dividends
 
—
%
 
—
%
 
—
%
Weighted average fair value at measurement date
 
$
15.47

 
$
8.88

 
$
7.05