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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Statement Of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 111,588	$ 97,814
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	28,798,700	28,588,863
Common stock, shares outstanding	21,531,679	21,821,842
Treasury stock, shares	7,267,021	6,767,021

X

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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