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Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Summary of Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share
The following table presents reconciliations for the numerators and denominators of basic and diluted earnings per share (“EPS”) during fiscal 2025, 2024 and 2023: 
 Year Ended September 30,
 202520242023
 (In thousands, except per share data)
Numerator for diluted and basic earnings per share:
Net income$651,946 $512,811 $429,375 
Denominator — share:
Basic weighted-average shares24,239 24,676 24,986 
Effect of dilutive securities322 403 381 
Diluted weighted-average shares24,561 25,079 25,367 
Earnings per share:
Basic$26.90 $20.78 $17.18 
Diluted$26.54 $20.45 $16.93