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Stock-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2013
Jan. 31, 2013
Apr. 30, 2014
Number of Options [Roll Forward]      
Outstanding as of July 31, 2013 14,922   14,922
Grants of options     4,966
Exercises 14,000 73,228 (335)
Forfeitures or expirations     (87)
Outstanding as of April 30, 2014     19,466
Exercisable as of April 30, 2014     13,144
Weighted - Average Exercise Price [Roll Forward]      
Outstanding as of July 31, 2013 $ 16.75   $ 16.75
Grants of options     $ 35.75
Exercise Price $ 16.43 $ 8.89 $ 17.59
Forfeitures or expirations     $ 17.69
Outstanding as of April 30, 2014     $ 21.59
Exercisable as of April 30, 2014     $ 16.24
Weighted - Average Remaining Contractual Term [Roll Forward]      
Outstanding as of July 31, 2013     5 years 10 months 28 days
Outstanding as of April 30, 2014     6 years 4 months 2 days
Exercisable as of April 30, 2014     5 years 4 days
Aggregate Intrinsic Value [Roll Forward]      
Outstanding as of July 31, 2013 $ 235,086   $ 235,086
Outstanding as of April 30, 2014     285,896
Exercisable as of April 30, 2014     $ 263,249