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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2018
Income Tax Contingency [Line Items]                    
Effective Income Tax Rate Reconciliation, Percent, Total 14.60%     16.80%       91.20% 6.70%  
Income Tax Expense Benefit Special Items         $ 19.7          
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 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              
Effective Income Tax Rate Continuing Operations Excluding Special Items               14.90% 19.50%  
Scenario, Plan [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, Plan [Member]                    
Income Tax Contingency [Line Items]                    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                   28.10%