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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Income Tax Contingency [Line Items]              
Effective Income Tax Rate Reconciliation, Percent, Total 202.00%       141.20%    
Income Tax Expense Benefit Special Items     $ 10.1     $ 10.1  
Effective Income Tax Rate Excluding Special Items     362.00%     (7.60%)  
Effective Income Tax Rate Excluding Settlements     19.40%     20.80%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         35.00%    
Transition Tax Expenses $ 96.3       $ 96.3    
Effective Income Tax Rate Reconciliation Impact On Foreign Tax Rate         10.50%    
Other Income Tax Expense (Benefit), Continuing Operations $ 109.6            
Effective Income Tax Rate Excluding Tax Act 15.60%       15.00%    
Other Income Tax Expense Benefit Continuing Operations Tax Act $ 101.2       $ 101.2    
Income Tax Deferred Taxes Impact Tax Act 2.5       2.5    
State Income And Foreign With holding Taxes Un distributed Foreign Earnings Tax Act 2.7       2.7    
Income Tax Expense Benefit Tax Act Adjustment   $ 0.3          
Scenario, Forecast [Member]              
Income Tax Contingency [Line Items]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       21.00%      
Adtalem Brazil [Member]              
Income Tax Contingency [Line Items]              
Undistributed Earnings of Foreign Subsidiaries $ 91.0       $ 91.0    
Minimum [Member] | Scenario, Forecast [Member]              
Income Tax Contingency [Line Items]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent             28.10%