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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2017
 [1]
Apr. 30, 2017
 [1],[2]
Jan. 31, 2017
 [1],[2]
Oct. 31, 2016
 [1],[2]
Jul. 31, 2016
 [1]
Apr. 30, 2016
 [1]
Jan. 31, 2016
 [1]
Oct. 31, 2015
 [1]
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Income From Continuing Operations Before Taxes [Abstract]                      
Income before income tax expense $ 106,379 $ 131,088 $ 100,099 $ 102,534 $ 105,985 $ 116,568 $ 91,552 $ 81,760 $ 440,100 $ 395,865 $ 332,069
UNITED STATES                      
Income From Continuing Operations Before Taxes [Abstract]                      
U.S.                 385,526 339,013 286,169
International [Member]                      
Income From Continuing Operations Before Taxes [Abstract]                      
International                 $ 54,574 $ 56,852 $ 45,900
[1] Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.
[2] arnings per share data were revised from previously reported amounts due to a two-for-one common stock split effected in the form of a stock dividend. See Note 1 — Summary of Significant Accounting Policies.