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Net Income Per Common Share Net Income per Common Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		9 Months Ended
	Jul. 11, 2019	Jun. 26, 2019	Jun. 05, 2019	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Anti-dilutive securities (in shares)				54,000	5,000	48,000	5,000
Common Stock, Dividends, Per Share, Cash Paid				$ 1.76	$ 1.47	$ 4.70	$ 3.576
Cash dividends declared per share				$ 1.76	$ 1.47	$ 4.70	$ 3.576
Payments of Dividends				$ 70,900	$ 59,500	$ 189,566	$ 144,681
Preferred Stock, Par or Stated Value Per Share				$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Scenario, Forecast [Member]
Cash dividends declared per share			$ 1.76
Dividends Payable, Date to be Paid	Jul. 11, 2019
Dividends Payable, Date of Record		Jun. 26, 2019
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