CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Allowance for expected credit losses	$ 4,622	$ 4,318
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	88,445,490	87,808,922
Common stock, shares outstanding	74,983,621	74,347,053
Treasury Stock, Shares [Abstract]
Treasury stock, shares	13,461,869	13,461,869