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Earnings per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Numerator for diluted and basic earnings per share:        
Net income $ 162,615 $ 129,799 $ 315,143 $ 250,864
Denominator — share:        
Basic weighted-average shares (in shares) 24,389 24,819 24,383 24,791
Effect of dilutive securities (in shares) 296 335 373 395
Diluted weighted-average shares (in shares) 24,685 25,154 24,756 25,186
Earnings per share:        
Basic (in dollars per share) $ 6.67 $ 5.23 $ 12.92 $ 10.12
Diluted (in dollars per share) $ 6.59 $ 5.16 $ 12.73 $ 9.96