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Income Taxes - Summary of Earnings Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Earnings before income taxes
United States									$ 94,854	$ 46,986	$ 53,280
Other									2,586	1,967
Income before income tax provision	$ 31,967	$ 46,482	$ 6,703	$ 12,288	$ 9,484	$ 25,806	$ 7,193	$ 6,470	$ 97,440	$ 48,953	$ 53,280

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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