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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
	Oct. 17, 2016	Oct. 31, 2021	Oct. 31, 2020	Jul. 31, 2021	Dec. 18, 2020
Anti-dilutive securities (in shares)		500,000	600,000
Common Stock, Dividends, Per Share, Cash Paid		$ 0.88
Cash dividends declared per share		$ 0.88	$ 0
Payments of Dividends		$ 35,594	$ 0
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Dividends, Cash		$ 35,600
Dividends Payable, Date to be Paid		Jan. 11, 2022
Dividends Payable, Date of Record		Dec. 28, 2021
Dividends Payable, Date Declared		Dec. 08, 2021
Convertible Debt [Member]
Debt Instrument, Face Amount					$ 575,000
Debt Instrument, Interest Rate, Stated Percentage					0.00%
Debt Instrument, Convertible, Conversion Price		$ 407.17
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