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Earnings Per Share
 12 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Share Earnings per Share
The computations of basic and diluted earnings per share are as follows:
Year Ended September 30,
 202420232022
 (In millions, except share and per share amounts)
Numerator:
Net income$203.4 $166.9 $178.8 
Denominator:
Weighted average common shares outstanding — basic50,426,040 49,986,526 49,818,132 
Dilutive effect of stock-based compensation367,914 137,587 31,762 
Total weighted average shares outstanding — diluted50,793,954 50,124,113 49,849,894 
Basic net income per common share$4.03 $3.34 $3.59 
Diluted net income per common share$4.00 $3.33 $3.59