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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 35,985	$ 39,312	$ 23,547
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(669)
Total other comprehensive loss, net of tax	(669)
Comprehensive income	$ 35,316	$ 39,312	$ 23,547

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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