SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Summary Of Significant Accounting Policies [Line Items]
Reserves related to uncollectible accounts and refunds	$ 33,200	$ 35,000	$ 33,200	$ 35,000	$ 30,600
Net balance of capitalized software development costs	$ 8,600	$ 15,000	$ 8,600	$ 15,000	11,800
Anti-dilutive shares excluded from computations of earnings per share	1,377,000	2,643,000	1,866,000	2,808,000
Cumulative translation losses	$ 61,100	$ 51,100	$ 61,100	$ 51,100	59,400
Advertising expense	22,600	24,200	49,000	48,500
Provisions For Refund Payments	4,600	4,000	$ 9,100	8,200
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	19,000		$ 29,900
Cost of Goods and Services Sold, Total	178,970	179,148	374,911	366,634
Insurance Settlements Receivable	20,800		20,800
Loss from Catastrophes	30,300		44,000
Unusual or Infrequent Item, or Both, Insurance Proceeds	30,500		39,800
Proceeds from Insurance Settlement, Operating Activities	19,000		20,800
Discontinued Operations, Held-for-sale [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of Long-Lived Assets to be Disposed of			23,400
Accounting Standards Update 2016-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative Effect on Retained Earnings, Tax			200
Cumulative Effect on Retained Earnings, before Tax			600
Noncontrolling Interest
Summary Of Significant Accounting Policies [Line Items]
Cumulative translation losses	1,300	1,100	1,300	1,100	1,300
Educational Services
Summary Of Significant Accounting Policies [Line Items]
Provision for Doubtful Accounts	5,100	6,400	11,200	11,900
Hurricane Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 19,000		29,900
Cost of Goods and Services Sold, Total			$ 13,400
Minimum
Summary Of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage	20.00%		20.00%
Maximum
Summary Of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Adtalem Brazil
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary	2.10%		2.10%
Adtalem Global Education Inc.
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary	97.90%		97.90%
Cumulative translation losses	$ 59,800	50,000	$ 59,800	50,000	58,100
Tax effect on unrealized gains on available-for-sale securities	400	200	400	200	300
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	$ 200	$ 100	$ 200	$ 100	$ 200