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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% |  |

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