CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income/(Loss)	Accumulated Other Comprehensive Income/(Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Total MiX Telematics Limited Stockholders' Equity	Total MiX Telematics Limited Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Total MiX Telematics Limited Stockholders' Equity Cumulative Effect, Period of Adoption, Adjusted Balance	Non-Controlling Interest	Non-Controlling Interest Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Currency Translation Adjustments
Beginning balance (in shares) at Mar. 31, 2017				603,435,000
Beginning balance at Mar. 31, 2017	$ 104,249			$ 73,158		$ (9,227)		$ 7,835		$ (7,990)		$ 40,589			$ 104,365			$ (116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income/(loss)	23,706							9,754				13,947			23,701			5
Net income for the year	13,952											13,947			13,947			5
Other comprehensive income (loss)	9,754							9,754							9,754
Total transactions with owners (in shares)				985,000
Total transactions with owners	(4,017)			$ (611)						577		(4,099)			(4,133)			116
Issuance of common stock in relation to stock options and SARs exercised (in shares)				6,001,000
Issuance of common stock in relation to stock options and SARs exercised	825			$ 825											825
Stock-based compensation	693									693					693
Dividends declared on ordinary shares	(4,099)											(4,099)			(4,099)
Transactions with non-controlling interest										(116)					(116)			116
Ordinary shares repurchased and cancelled (in shares)				5,016,000
Ordinary shares repurchased and cancelled	(1,436)			$ (1,436)											(1,436)
Ending balance (in shares) at Mar. 31, 2018				604,420,000	604,420,000
Ending balance at Mar. 31, 2018	123,938	$ 2,417	$ 126,355	$ 72,547	$ 72,547	(9,227)	$ (9,227)	17,589	$ 17,589	(7,413)	$ (7,413)	50,437	$ 2,417	$ 52,854	123,933	$ 2,417	$ 126,350	5	$ 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income/(loss)	(664)							(15,474)				14,810			(664)			0
Net income for the year	14,810											14,810			14,810			0
Other comprehensive income (loss)	(15,474)							(15,474)							(15,474)					$ (15,474)
Total transactions with owners (in shares)				(2,473,000)
Total transactions with owners	(8,750)			$ (4,347)						511		(4,914)			(8,750)
Issuance of common stock in relation to stock options and SARs exercised (in shares)				6,685,000
Issuance of common stock in relation to stock options and SARs exercised	1,002			$ 1,002											1,002
Stock-based compensation	511									511					511
Dividends declared on ordinary shares	(4,914)											(4,914)			(4,914)
Ordinary shares repurchased and cancelled (in shares)				9,158,000
Ordinary shares repurchased and cancelled	$ (5,349)			$ (5,349)											(5,349)
Ending balance (in shares) at Mar. 31, 2019	601,900,000			601,948,000	601,948,000
Ending balance at Mar. 31, 2019	$ 116,941	$ (262)	$ 116,679	$ 68,200	$ 68,200	(9,227)	$ (9,227)		$ 2,093	(6,902)	$ (6,902)	62,750	$ (240)	$ 62,510	116,936	$ (262)	$ 116,674	5	$ 5	2,115
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income/(loss)	(2,176)							(13,163)				10,987			(2,176)			0
Net income for the year	10,987											10,987			10,987			0
Other comprehensive income (loss)	(13,163)							(13,163)							(13,163)					$ (13,163)
Total transactions with owners (in shares)				(1,013,000)
Total transactions with owners	(15,478)			$ (1,678)		(8,088)				303		(6,015)			(15,478)
Issuance of common stock in relation to stock options and SARs exercised (in shares)				2,026,000
Stock-based compensation	303									303					303
Dividends declared on ordinary shares	(6,015)											(6,015)			(6,015)
Ordinary shares repurchased and cancelled (in shares)				3,039,000
Ordinary shares repurchased and cancelled	(1,678)			$ (1,678)											(1,678)
Purchases of treasury stock	$ (8,088)					(8,088)									(8,088)
Ending balance (in shares) at Mar. 31, 2020	600,900,000			600,934,000
Ending balance at Mar. 31, 2020	$ 99,025			$ 66,522		$ (17,315)		$ (11,070)		$ (6,599)		$ 67,482			$ 99,020			$ 5