CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
CONDENSED CONSOLIDATED BALANCE SHEETS
Net of allowance for credit losses	$ 2,693	$ 2,612
Net of accumulated depreciation	166,699	165,322
Net of accumulated amortization	$ 189,819	$ 175,928
Preferred stock, par value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,751,449	30,707,748
Treasury stock, shares	4,993,372	4,854,997