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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items]      
Net balance of capitalized software development costs $ 12,400 $ 5,000 $ 13,500
Anti-dilutive shares excluded from computations of earnings per share 272,000 1,893,000  
Cumulative translation losses $ 163,200 $ 36,100 142,600
Advertising expense 19,000 20,200  
Impairment of Long-Lived Assets Held-for-use 2,200    
Cost of Goods and Services Sold, Total 148,653 173,176  
Loss from Catastrophes 6,900 13,600  
Deferred Revenue, Revenue Recognized 83,700    
Allowance for Doubtful Accounts Receivable, Current 21,900 27,000 27,600
Asset Impairment Charges 37,800    
Cumulative Effect on Retained Earnings, Net of Tax 0 (236)  
Accounting Standards Update 2016-01 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative Effect on Retained Earnings, Net of Tax 400    
Noncontrolling Interest      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative translation losses 3,800 800 3,000
Hurricane Expense [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Impairment of Long-Lived Assets Held-for-use   10,900  
Cost of Goods and Services Sold, Total   13,600  
Incremental Costs [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Unusual or Infrequent Item, or Both, Insurance Proceeds $ 6,900 9,200  
Asset Impairment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Unusual or Infrequent Item, or Both, Insurance Proceeds   1,800  
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Equity Method Investment, Ownership Percentage 20.00%    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Adtalem Brazil      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest of parent in subsidiary 97.90%    
Adtalem Global Education Inc.      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative translation losses $ 159,400 35,300 139,600
Tax effect on unrealized gains on available-for-sale securities   400 400
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax   $ 200 $ 100
Edupristine      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest of parent in subsidiary 69.00%    
Kaizen      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest of parent in subsidiary 31.00%    
Adtalem Brazil Senior Management Group      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest of parent in subsidiary 2.10%