Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 527	$ 537
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	71,000,000,000	71,000,000,000
Common stock, shares issued	42,839,088,000	42,712,296,000