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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
	Jun. 27, 2018	Jun. 12, 2018	Jun. 06, 2018	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Jul. 31, 2017
Anti-dilutive securities (in shares)				5,000	12,000	5,000	4,000
Cash dividends declared per share				$ 1.470	$ 1.053	$ 3.576	$ 2.673
Payments of Dividends				$ 59,500	$ 42,300	$ 144,681	$ 104,035
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			$ 1.470
Dividends Payable, Date to be Paid		Jul. 12, 2018
Dividends Payable, Date of Record	Jun. 27, 2018
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

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