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SHAREHOLDERS' EQUITY, Common Stock Outstanding Roll Forward (Details) - shares
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance beginning of period (in shares) 194,600,000 203,100,000 198,139,594 203,300,000
Repurchases of common stock under the Board of Directors’ common stock repurchase authorization (in shares) (2,600,000) (3,300,000) (7,700,000) (5,300,000)
Issuances due to vesting of RSUs, employee stock purchases, and exercise of stock options, net of forfeitures (in shares) 100,000 200,000 1,700,000 2,000,000.0
Balance end of period (in shares) 192,124,666 200,000,000.0 192,124,666 200,000,000.0