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Stock-Based Compensation - SARs Outstanding and the Changes (Details)
$ / shares in Units, $ in Millions
 9 Months Ended
Jun. 30, 2025
USD ($)
$ / shares
shares
Additional Disclosures  
Weighted Average Remaining Contractual Term 1 year 10 months 24 days
SARs  
SARs (in thousands)  
Outstanding, Beginning Balance (in shares) | shares 1,760,400
Exercised (in shares) | shares (3,400)
Forfeited, canceled or expired (in shares) | shares (250,000.0)
Outstanding, Ending Balance (in shares) | shares 1,507,000
Vested and expected to vest (in shares) | shares 1,497,900
Exercisable (in shares) | shares 1,341,600
Weighted Average Exercise Price  
Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 29.11
Exercised (in dollars per share) | $ / shares 13.30
Forfeited, canceled or expired (in dollars per share) | $ / shares 29.19
Outstanding, Ending Balance (in dollars per share) | $ / shares 29.14
Vested and expected to vest, Weighted Average Exercise Price (in dollars per share) | $ / shares 29.14
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 29.16
Additional Disclosures  
Weighted Average Remaining Contractual Term 6 years
Vested and expected to vest, Weighted Average Remaining Contractual Term 6 years
Exercisable, Weighted Average Remaining Contractual Term 5 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value | $ $ 0.0
Vested and expected to vest, Aggregate Intrinsic Value | $ 0.0
Exercisable, Aggregate Intrinsic Value | $ $ 0.0