SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Summary Of Significant Accounting Policies [Line Items]
Net balance of capitalized software development costs	$ 11,900	$ 8,600	$ 11,900	$ 8,600	$ 13,500
Anti-dilutive shares excluded from computations of earnings per share	227,000	1,377,000	282,000	1,866,000
Cumulative translation losses	$ 143,500	$ 61,100	$ 143,500	$ 61,100	142,600
Advertising expense	21,300	17,200	40,200	37,400
Impairment of Long-Lived Assets Held-for-use			2,000
Cost of Goods and Services Sold, Total	158,232	157,443	306,885	330,619
Loss from Catastrophes	5,600	30,300	12,500	44,000
Deferred Revenue, Revenue Recognized			95,100
Allowance for Doubtful Accounts Receivable, Current	19,500	26,800	19,500	26,800	27,600
Asset Impairment Charges	2,300		40,100
Cumulative Effect on Retained Earnings, Net of Tax			0	(236)
Proceeds from Insurance Settlement, Operating Activities		19,000		20,800
Gain on Business Interruption Insurance Recovery	15,571	0	15,571	0
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	3,200	1,300	3,200	1,300	3,000
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
Asset Impairment [Member]
Summary Of Significant Accounting Policies [Line Items]
Unusual or Infrequent Item, or Both, Insurance Proceeds	$ 5,600	30,500	$ 12,500	39,800
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	97.90%		97.90%
Adtalem Global Education Inc.
Summary Of Significant Accounting Policies [Line Items]
Cumulative translation losses	$ 140,300	59,800	$ 140,300	59,800	139,600
Tax effect on unrealized gains on available-for-sale securities		400		400	400
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax		$ 200		$ 200	$ 100
Edupristine
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary	69.00%		69.00%
Kaizen
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary	31.00%		31.00%
Adtalem Brazil Senior Management Group
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary	2.10%		2.10%