CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) - $ / shares |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Statement of Stockholders' Equity [Abstract] | ||||
| Cash dividends declared and paid, quarterly, per Class A share (in dollars per share) | $ 0.30 | $ 0.25 | $ 0.30 | $ 0.25 |