Earnings per share (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2022 USD ($) shares $ / shares	Mar. 31, 2021 USD ($) shares $ / shares	Mar. 31, 2020 USD ($) shares $ / shares
Basic earnings per share
Net income attributable to MiX Telematics Limited stockholders | $	$ 8,947	$ 14,595	$ 10,987
Weighted average number of ordinary shares in issue and outstanding (in shares)	551,923,000	549,415,000	553,653,000
Basic earnings per share (in dollars per share) | $ / shares	$ 0.02	$ 0.03	$ 0.02
Weighted average number of American Depository Shares in issue (in shares)	22,077,000	21,977,000	22,146,000
Basic earnings per American Depository Share (in dollars per share) | $ / shares	$ 0.41	$ 0.66	$ 0.50
Diluted earnings per share
Diluted income attributable to ordinary shareholders | $	$ 8,947	$ 14,595	$ 10,987
Weighted average number of ordinary shares in issue and outstanding (in shares)	551,923,000	549,415,000	553,653,000
Diluted weighted average number of ordinary shares in issue and outstanding (in shares)	563,958,000	560,624,000	567,879,000
Diluted earnings per share (in dollars per share) | $ / shares	$ 0.02	$ 0.03	$ 0.02
Diluted weighted average number of American Depository Shares in issue and outstanding (in shares)	22,558,000	22,425,000	22,715,000
Diluted earnings per American Depository Share (in dollars per share) | $ / shares	$ 0.40	$ 0.65	$ 0.48
Equivalent of one ADS (in shares)	25	25	25
Share Appreciation Rights
Diluted earnings per share
Potentially dilutive effect of share-based payment arrangements (in shares)	10,531,000	9,872,000	12,560,000
RSUs
Diluted earnings per share
Potentially dilutive effect of share-based payment arrangements (in shares)	1,504,000	774,000	0
Stock Options
Diluted earnings per share
Potentially dilutive effect of share-based payment arrangements (in shares)	0	562,000	1,666,000