CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)	3 Months Ended			6 Months Ended
	Sep. 30, 2021 R / shares	Sep. 30, 2021 $ / shares	Sep. 30, 2020 $ / shares	Sep. 30, 2021 R / shares	Sep. 30, 2020 R / shares
Statement of Stockholders' Equity [Abstract]
Dividends declared (in ZAR/USD per share) | (per share)	R 0.04	$ 0.3	$ 0.3	R 0.04	R 0.04