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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 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator for diluted and basic earnings per share:        
Net income $ 64,076 $ 64,152 $ 177,285 $ 137,540
Denominator - share:        
Basic weighted-average shares (in shares) 29,005 28,967 29,075 29,000
Effect of dilutive securities (in shares) 739 1,325 891 1,295
Diluted weighted-average shares (in shares) 29,744 30,292 29,966 30,295
Earnings per share:        
Basic (in dollars per share) $ 2.21 $ 2.21 $ 6.10 $ 4.74
Diluted (in dollars per share) $ 2.15 $ 2.12 $ 5.92 $ 4.54