Net Income Per Common Share Net Income per Common Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
Oct. 17, 2016	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Jul. 31, 2019
Anti-dilutive securities (in shares)		4,000	54,000	1,000	48,000
Common Stock, Dividends, Per Share, Cash Paid		$ 1.76	$ 1.76	$ 5.28	$ 4.70
Cash dividends declared per share		1.76	1.76	$ 5.28	$ 4.70
Payments of Dividends				$ 212,734	$ 189,566
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Dividends, Cash		$ 70,700	$ 70,900	$ 212,700	$ 189,600
Common Stock [Member]
Stock Issued During Period, Shares, New Issues	3,327,719
Exchangeable Shares [Member]
Stock Issued During Period, Shares, New Issues	418,095

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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