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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator for diluted and basic earnings per share:
Net income	$ 151,198	$ 64,076	$ 306,364	$ 177,285
Denominator - share:
Basic weighted-average shares (in shares)	28,687	29,005	28,967	29,075
Effect of dilutive securities (in shares)	508	739	538	891
Diluted weighted-average shares (in shares)	29,195	29,744	29,505	29,966
Earnings per share:
Basic (in dollars per share)	$ 5.27	$ 2.21	$ 10.58	$ 6.10
Diluted (in dollars per share)	$ 5.18	$ 2.15	$ 10.38	$ 5.92

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