Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts of $2,608 and $1,762, respectively	$ 2,608	$ 1,762
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (shares)	46,955,163	47,079,645
Common stock, shares outstanding (shares)	46,955,163	47,079,645
Treasury stock (shares)	260,900	260,900