Net Income Per Common Share Net Income per Common Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
Oct. 17, 2016	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020
Anti-dilutive securities (in shares)		600,000	700,000
Common Stock, Dividends, Per Share, Cash Paid			$ 1.76
Cash dividends declared per share		$ 0	$ 1.76
Payments of Dividends		$ 0	$ 71,091
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Dividends, Cash			$ 71,100
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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