Net Income Per Common Share Net Income per Common Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Jan. 10, 2018	Dec. 27, 2017	Dec. 06, 2017	Oct. 31, 2017	Oct. 31, 2016	Jul. 31, 2017
Anti-dilutive securities (in shares)				1,300,000	1,700,000
Cash dividends declared per share				$ 1.053	$ 0.810
Payments of Dividends				$ 42,603	$ 29,390
Preferred Stock, Par or Stated Value Per Share				$ 0.01	$ 0.01	$ 0.01
Scenario, Forecast [Member]
Cash dividends declared per share			$ 1.053
Dividends Payable, Date to be Paid	Jan. 10, 2018
Dividends Payable, Date of Record		Dec. 27, 2017
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