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Description of Business and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Oct. 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, 2016
 
$
(109,194
)
Gain on foreign currency translation
 
8,518

Cumulative loss on foreign currency translation as of July 31, 2017
 
$
(100,676
)
Loss on foreign currency translation
 
(1,480
)
Cumulative loss on foreign currency translation as of October 31, 2017
 
$
(102,156
)