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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Statement Of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 95,706	$ 86,270
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	28,464,364	28,130,312
Common stock, shares outstanding	21,907,520	21,863,291
Treasury stock, shares	6,556,844	6,267,021

X

- Definition

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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