Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Jul. 31, 2020	[1]	Apr. 30, 2020	[1]	Jan. 31, 2020	[1]	Oct. 31, 2019	[1]	Jul. 31, 2019	[1]	Apr. 30, 2019	[1]	Jan. 31, 2019	[1]	Oct. 31, 2018	[1]	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Income From Continuing Operations Before Taxes [Abstract]
Income before income taxes	$ 201,883		$ 191,800		$ 205,074		$ 202,082		$ 187,070		$ 204,129		$ 164,966		$ 148,786		$ 800,839	$ 704,951	$ 562,511
UNITED STATES
Income From Continuing Operations Before Taxes [Abstract]
U.S.																	740,171	634,874	501,961
International [Member]
Income From Continuing Operations Before Taxes [Abstract]
International																	$ 60,668	$ 70,077	$ 60,550

[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.