Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts of $1,762 and $1,239, respectively	$ 1,762	$ 1,239
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)	47,079,645	63,305,434
Common stock, shares outstanding (shares)	47,079,645	63,305,434
Treasury stock (shares)	260,900	260,900