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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

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