Stockholder's Investments - Schedule of Other Activity in Stockholders' Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Class of Stock [Line Items]
Sale Of Shares At Cost	$ 0	$ 0	$ 0
Purchase Of Shares At Cost	0	0	0
Ending Balance, Other Stockholders Equity	0	0	0	$ 0
Shares Held Rabbi Trust At Cost [Member]
Class of Stock [Line Items]
Sale Of Shares At Cost	(721)	(277)	(460)
Purchase Of Shares At Cost	(1,242)	(1,472)	(1,293)
Ending Balance, Other Stockholders Equity	$ (11,055)	$ (10,534)	$ (9,339)	$ (8,506)
Ending Balance, Other Stockholders Equity Shares	318,285	315,916	292,329	285,533
Deferred Compensation [Member]
Class of Stock [Line Items]
Sale Of Shares At Cost	$ (721)	$ (277)	$ (460)
Purchase Of Shares At Cost	(1,242)	(1,472)	(1,293)
Ending Balance, Other Stockholders Equity	$ 11,055	$ 10,534	$ 9,339	$ 8,506
Ending Balance, Other Stockholders Equity Shares	318,285	315,916	292,329	285,533