INCOME TAXES - Additional Information (Detail)	12 Months Ended			18 Months Ended
	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2017
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Federal	$ 100,000			$ 100,000
Operating Loss Carryforwards, State and Local	317,600,000			317,600,000
Operating Loss Carryforwards, Foreign	$ 55,000,000			55,000,000
Number of operating units benefit from local tax incentives	4
Valuation Allowance	$ 9,943,000	$ 11,496,000	$ 9,456,000	9,943,000
Undistributed Earnings of Foreign Subsidiaries	$ 88,800,000			$ 88,800,000
Effective Income Tax Rate Reconciliation, Percent	20.10%	42.30%	7.30%
Effective Income Tax Rate Continuing Operations Excluding Special Items	19.00%	19.10%
Other Income Tax Expense Benefit Continuing Operations Tax Act		$ 103,900,000
Income Tax Expense Benefit Special Items		$ 48,900,000
U.S. federal corporate tax rate	21.00%	28.10%	35.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation Impact On Foreign Tax Rate	10.50%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 33,400,000	$ 34,400,000		$ 33,400,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	26,500,000			26,500,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,800,000	2,600,000	$ 2,000,000	$ 2,800,000
Income Tax Examination, Penalties and Interest Expense	$ 100,000	600,000	$ 400,000
Adtalem Brazil [Member]
Income Tax Contingency [Line Items]
Income Tax Expense Benefit Special Items		$ 8,800,000