CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares |
3 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
Statement of Stockholders' Equity [Abstract] | ||||
Cash dividends declared and paid, quarterly, per as-converted share (USD per share) | $ 0.195 | $ 0.25 | $ 0.21 | $ 0.165 |