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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
	Oct. 17, 2016	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Dec. 18, 2020	Jul. 31, 2020
Anti-dilutive securities (in shares)		1,000	4,000	2,000	1,000
Common Stock, Dividends, Per Share, Cash Paid			$ 1.76		$ 5.28
Cash dividends declared per share		$ 0	1.76	$ 0	$ 5.28
Payments of Dividends				$ 0	$ 212,734
Preferred Stock, Par or Stated Value Per Share	$ 0.01	0.01	$ 0.01	$ 0.01	$ 0.01		$ 0.01
Dividends, Cash			$ 70,700		$ 212,700
Debt Instrument, Face Amount						$ 575,000
Convertible Debt [Member]
Debt Instrument, Face Amount						$ 575,000
Debt Instrument, Interest Rate, Stated Percentage						0.00%
Debt Instrument, Convertible, Conversion Price		$ 407.17		$ 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