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Net Income Per Share (Tables)
 6 Months Ended
Mar. 31, 2024
Net Income Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
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,
 2024202320242023
Numerator
Net income$119,021 $81,436 $257,403 $153,838 
Denominator
Weighted average shares outstanding — basic58,788 60,330 58,956 60,211 
Dilutive effect of common shares from stock options and restricted stock units
792 361 661 326 
Weighted average shares outstanding — diluted59,580 60,691 59,617 60,537 
Basic net income per share$2.02 $1.35 $4.37 $2.55 
Diluted net income per share$2.00 $1.34 $4.32 $2.54