Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Line of Credit
Debt Instrument
Borrowing capacity	$ 306,100,000	$ 297,300,000
Unsecured Revolving Credit Facility
Debt Instrument
Borrowing capacity	63,000,000
Long-term remaining borrowing capacity	$ 396,300,000
Unsecured Revolving Credit Facility | Minimum
Debt Instrument
Commitment fee (as a percent)	0.08%
Unsecured Revolving Credit Facility | Maximum
Debt Instrument
Commitment fee (as a percent)	0.25%
Unsecured Revolving Credit Facility | 1.29 % Variable Rate Unsecured Credit Facility Maturing 2026
Debt Instrument
Borrowing capacity	$ 500,000,000
Multi-currency revolving credit facility
Debt Instrument
Borrowing capacity	17,000,000
Multi-currency revolving credit facility | Line of Credit
Debt Instrument
Additional borrowing capacity on line of credit under certain conditions	$ 250,000,000