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Stockholder's Equity - Unvested Shares from Stock Option Award (Details)
 12 Months Ended
Jul. 31, 2022
$ / shares
shares
Shares  
Unvested shares, Beginning balance (in shares) | shares 3,261,000
Grants of non-vested shares (in shares) | shares 665,000
Vested (in shares) | shares (1,331,000)
Forfeitures or expirations (in shares) | shares (201,000)
Unvested shares, Ending balance (in shares) | shares 2,394,000
Weighted Average Grant- date Fair Value  
Unvested shares, Beginning balance (in dollars per share) | $ / shares $ 22.80
Grants of non-vested shares (in dollars per share) | $ / shares 44.94
Vested (in dollars per share) | $ / shares 21.72
Forfeitures or expirations (in dollars per share) | $ / shares 18.36
Unvested shares, Ending balance (in dollars per share) | $ / shares $ 29.71