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Stockholders' Equity And Stock-Based Compensation (Summary Of Restricted Stock Units Issued To Officers, Directors, And Employees Under 2005 Stock Incentive Plan) (Details)
shares in Thousands
 9 Months Ended
Jun. 30, 2023
$ / shares
shares
Shares  
Shares, Non-vested at beginning of period (in shares) | shares 3,502
Shares, Granted (in shares) | shares 1,617
Shares, Vested (in shares) | shares (1,165)
Shares, Forfeitures (in shares) | shares (133)
Shares, Non-vested at end of period (in shares) | shares 3,821
Weighted-Average Grant Date Fair Value   
Weighted Average Fair Value, Non-vested at beginning of period (in dollars per share) | $ / shares $ 83.09
Weighted Average Fair Value, Granted (in dollars per share) | $ / shares 69.15
Weighted Average Fair Value, Vested (in dollars per share) | $ / shares 78.03
Weighted Average Fair Value, Forfeitures (in dollars per share) | $ / shares 80.17
Weighted Average Fair Value, Non-vested at end of period (in dollars per share) | $ / shares $ 78.83