Share-Based Compensation, Performance-Based Market Stock Units (Details)	12 Months Ended
	Jul. 31, 2020 shares
2020 rTSR RSUs [Member]
Performance-Based Market Stock Units [Abstract]
Number of shares accrued (in shares)	2,167
2019 rTSR RSUs [Member]
Performance-Based Market Stock Units [Abstract]
Number of shares accrued (in shares)	6,383
2018 rTSR RSUs [Member]
Performance-Based Market Stock Units [Abstract]
Number of shares accrued (in shares)	8,816