CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS
Allowance for accounts receivable (in dollars)	$ 5,786	$ 5,721
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	112,008,961	111,956,875
Common stock, shares outstanding	108,943,554	108,604,047
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0