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Net Income Per Share
 6 Months Ended
Mar. 31, 2025
Net Income Per Share [Abstract]  
Net Income Per Share Net Income Per Share
Basic net income per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per share is computed by dividing net income by the weighted average number of common and dilutive common stock equivalent shares outstanding during the period. The Company's nonvested restricted stock units do not have nonforfeitable rights to dividends or dividend equivalents and are not considered participating securities that should be included in the computation of earnings per share under the two-class method.
The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share data):
 Three months ended
March 31,		Six months ended
March 31,
 2025202420252024
Numerator
Net income$145,530 $119,021 $311,975 $257,403 
Denominator
Weighted average shares outstanding — basic57,886 58,788 58,098 58,956 
Dilutive effect of common shares from stock options and restricted stock units
878 792 815 661 
Weighted average shares outstanding — diluted58,764 59,580 58,913 59,617 
Basic net income per share$2.51 $2.02 $5.37 $4.37 
Diluted net income per share$2.48 $2.00 $5.30 $4.32 
Anti-dilutive stock-based awards excluded from the calculations of diluted earnings per share were not material for the three and six months ended March 31, 2025 and 2024.