Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at the beginning of period - Net of Tax at Jun. 30, 2018	$ 793	$ 454,653	$ 1,917,373	$ (142,168)	$ (711,365)	$ 1,519,286
Cumulative effect adjustment upon the adoption			381	(381)
Net income attributable to Adtalem Global Education			7,765			7,765
Other comprehensive income, net of tax				(969)		(969)
Change in redeemable noncontrolling interest put option			615			615
Stock-based compensation		8,188				8,188
Net activity from stock-based compensation awards	8	17,035			(6,660)	10,383
Proceeds from stock issued under Colleague Stock Purchase Plan		70			242	312
Repurchase of common shares for treasury					(115,933)	(115,933)
Balance at the end of period - Net of Tax at Dec. 31, 2018	801	479,946	1,926,134	(143,518)	(833,716)	1,429,647
Balance at the beginning of period - Net of Tax at Jun. 30, 2018	793	454,653	1,917,373	(142,168)	(711,365)	1,519,286
Cumulative effect adjustment upon the adoption				(381)
Balance at the end of period - Net of Tax at Jun. 30, 2019	801	486,061	2,012,902	(137,290)	(970,944)	1,391,530
Balance at the beginning of period - Net of Tax at Sep. 30, 2018	798	469,545	1,908,465	(163,168)	(775,605)	1,440,035
Net income attributable to Adtalem Global Education			17,295			17,295
Other comprehensive income, net of tax				19,650		19,650
Change in redeemable noncontrolling interest put option			374			374
Stock-based compensation		3,819				3,819
Net activity from stock-based compensation awards	3	6,548			(1,472)	5,079
Proceeds from stock issued under Colleague Stock Purchase Plan		34			119	153
Repurchase of common shares for treasury					(56,758)	(56,758)
Balance at the end of period - Net of Tax at Dec. 31, 2018	801	479,946	1,926,134	(143,518)	(833,716)	1,429,647
Repurchase of common shares for treasury						(217,899)
Balance at the end of period - Net of Tax at Dec. 31, 2019	806	496,674	2,032,788	(159,118)	(1,076,238)	1,294,912
Balance at the beginning of period - Net of Tax at Jun. 30, 2019	801	486,061	2,012,902	(137,290)	(970,944)	1,391,530
Net income attributable to Adtalem Global Education			19,886			19,886
Other comprehensive income, net of tax				(21,828)		(21,828)
Stock-based compensation		8,594				8,594
Net activity from stock-based compensation awards	5	2,019			(5,275)	(3,251)
Repurchase of common shares for treasury					(100,019)	(100,019)
Balance at the end of period - Net of Tax at Dec. 31, 2019	806	496,674	2,032,788	(159,118)	(1,076,238)	1,294,912
Balance at the beginning of period - Net of Tax at Sep. 30, 2019	805	492,151	2,027,263	(176,739)	(1,016,287)	1,327,193
Net income attributable to Adtalem Global Education			5,525			5,525
Other comprehensive income, net of tax				17,621		17,621
Stock-based compensation		3,369				3,369
Net activity from stock-based compensation awards	1	1,154			(187)	968
Repurchase of common shares for treasury					(59,764)	(59,764)
Balance at the end of period - Net of Tax at Dec. 31, 2019	$ 806	$ 496,674	$ 2,032,788	$ (159,118)	$ (1,076,238)	$ 1,294,912