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Net Income (Loss) Per Share (Details 2) - $ / shares	3 Months Ended	6 Months Ended
Net Income (Loss) Per Share (Details 2) - $ / shares	Jan. 31, 2022	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Senior Notes \| Convertible Debt \| On or after October 15, 2024
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Conversion price (in dollars per share)	$ 113.75	$ 113.75
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from EPS (in shares)	20,216	22,458	35,724	48,598
Stock awards
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from EPS (in shares)	3,268,003	3,126,378	3,020,497	2,899,553
Convertible senior notes
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from EPS (in shares)	0	66,834	209,722	104,861