Net Loss Per Common Share Net Loss per Common Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
Oct. 17, 2016	Oct. 31, 2019	Oct. 31, 2018	Jul. 31, 2019
Anti-dilutive securities (in shares)		700,000	1,000,000.0
Common Stock, Dividends, Per Share, Cash Paid		$ 1.76	$ 1.47
Cash dividends declared per share		$ 1.76	$ 1.47
Payments of Dividends		$ 71,091	$ 59,547
Dividends Payable, Date to be Paid		Jan. 09, 2020
Dividends Payable, Date of Record		Dec. 26, 2019
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Dividends, Cash		$ 71,100	$ 59,500
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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