Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Jul. 31, 2016	[1]	Apr. 30, 2016	[1],[2]	Jan. 31, 2016	[1],[2]	Oct. 31, 2015	[1],[2]	Jul. 31, 2015	[1]	Apr. 30, 2015	[1]	Jan. 31, 2015	[1]	Oct. 31, 2014	[1]	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Income From Continuing Operations Before Taxes [Abstract]
Income before income taxes	$ 105,985		$ 116,568		$ 91,552		$ 81,760		$ 81,446		$ 88,296		$ 80,104		$ 82,223		$ 395,865	$ 332,069	$ 270,035
UNITED STATES
Income From Continuing Operations Before Taxes [Abstract]
U.S.																	339,013	286,169	230,966
International [Member]
Income From Continuing Operations Before Taxes [Abstract]
International																	$ 56,852	$ 45,900	$ 39,069

[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] Net income and earnings per share data were revised from previously reported amounts due to the adoption of ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting. See Note 1 — Summary of Significant Accounting Policies.