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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Summary Of Significant Accounting Policies [Line Items]      
Minimum protective endowment related to continuing operation in Pennsylvania $ 500,000    
Reserves related to uncollectible accounts and refunds 50,700,000 $ 69,100,000 $ 44,800,000
Net balance of capitalized software development costs $ 10,100,000 $ 16,600,000 11,800,000
Anti-dilutive shares excluded from computations of earnings per share 1,893,000 2,755,000  
Cumulative translation losses $ 36,100,000 $ 49,400,000 59,400,000
Advertising expense 52,900,000 57,600,000  
Impairment of Leasehold 200,000 1,300,000  
Provisions For Refund Payments $ 11,000,000 12,300,000  
Noncontrolling Interest, Description Where our ownership interest is less than 100%, but greater than 50%, the noncontrolling ownership interest is reported on our Consolidated Balance Sheets.    
Impairment of Long-Lived Assets Held-for-use $ 10,900,000    
Cost of Goods and Services Sold, Total 248,116,000 250,673,000  
Federal Trade Commission Settlement Agreement [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for Doubtful Accounts Receivable, Write-offs 24,200,000    
Accounting Standards Update 2016-09 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative Effect on Retained Earnings, Tax 200,000    
Cumulative Effect on Retained Earnings, before Tax 600,000    
Noncontrolling Interest      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative translation losses 800,000 1,100,000 1,300,000
Educational Services      
Summary Of Significant Accounting Policies [Line Items]      
Provision for Doubtful Accounts 10,300,000 10,100,000  
Hurricane Expense [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Cost of Goods and Services Sold, Total $ 13,600,000    
Perkins Student Loan Fund      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of Contributions 33.00%    
Allowances for expected losses on loan collections $ 2,600,000 2,600,000 2,600,000
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 2.10%    
Adtalem Global Education Inc.      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest of parent in subsidiary 97.90%    
Cumulative translation losses $ 35,300,000 48,300,000 58,100,000
Tax effect on unrealized gains on available-for-sale securities 400,000 200,000 300,000
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax $ 200,000 $ 100,000 $ 200,000