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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 478	$ 490
Property and equipment, accumulated depreciation	$ 20,058	$ 18,558
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	35,533,071	35,457,095
Common stock, shares outstanding	35,533,071	35,457,095
Treasury shares	2,373,946	2,222,083

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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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Amount of allowance for credit loss on accounts receivable, classified as current.

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