SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) shares in Thousands		3 Months Ended	8 Months Ended	12 Months Ended
	Jul. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)	Feb. 28, 2019	Jun. 30, 2019 USD ($) item shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares	Jan. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized included in the deferred revenue				$ 103,900,000
Allowance for bad debts		$ 23,700,000		$ 23,700,000	$ 27,600,000
Revenue practical expedient remaining performance obligation applied				true
Capitalized internal-use software development costs		10,600,000		$ 10,600,000	13,500,000
Property, Plant and Equipment, Gross		$ 725,713,000		$ 725,713,000	$ 765,182,000
Number of Operating Units Benefit from Local Tax Incentives				4
Decrease in noncontrolling interest	$ (6,200,000)
Anti-dilutive shares excluded from computations of earnings per share | shares				215	980	1,682
Stock Repurchase Program, Number Of Programs Authorized		11		11
Discount on re-issue of treasury stock			5.00%
Cumulative translation losses		$ 137,400,000		$ 137,400,000	$ 142,600,000
Advertising expense				85,600,000	80,500,000	$ 75,600,000
Cost of Educational Services				623,540,000	645,604,000	638,245,000
Gain on Business Interruption Insurance Recovery				15,571,000	0	0
Gain on lawsuit settlement		10,600,000
Settlement Gains				26,178,000	0	$ 0
Hurricane [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of Long-Lived Assets Held-for-use				0	31,000,000
Insurance settlements receivable					21,900,000
Loss from catastrophes				12,500,000	63,300,000
Unusual or Infrequent Item, or Both, Insurance Proceeds				12,500,000	59,000,000
Cost of Educational Services				0	13,400,000
Gain on Business Interruption Insurance Recovery				15,600,000
Hurricane [Member] | American University Of The Caribbean And Ross University [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of Long-Lived Assets Held-for-use					31,000,000
Insurance settlements receivable					21,900,000
Singularity University [Member]
Summary Of Significant Accounting Policies [Line Items]
Cost method investments		$ 5,000,000		$ 5,000,000
Cost method investments, interest percentage		3.68%		3.68%
DeVry University And Carrington College [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of Long-Lived Assets to be Disposed of				$ 2,000,000
Property, Plant and Equipment, Gross		$ 0		0
Accounting Standards Update 2016-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax					(236,000)
Accounting Standards Update 2016-01 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax				400,000
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment
Summary Of Significant Accounting Policies [Line Items]
Lease, Practical Expedients, Number Of Packages	3
Lease, practical expedients, package	true
Lease, practical expedient, use of hindsight	false
Lease, practical expedient, lessor single lease component	true
Reduction in prepaid rent expense	$ 3,000,000
Reduction in deferred rent liability	32,000,000
Reduction in restructure liability	25,000,000
Parent [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative translation losses		134,300,000		134,300,000	139,600,000
Tax effect on unrealized gains on available-for-sale securities		100,000		100,000	400,000
Other comprehensive income (loss), securities available-for-sale, tax				0	100,000
Noncontrolling Interest [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative translation losses		$ 3,100,000		$ 3,100,000	$ 3,000,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage		20.00%		20.00%
Finite live intangible assets amortization period				1 year
Minimum | Accounting Standards Update 2016-02 [Member] | Restatement Adjustment
Summary Of Significant Accounting Policies [Line Items]
Operating lease liabilities	325,000,000
Operating right-of-use assets	275,000,000
Maximum
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage		50.00%		50.00%
Revenue practical expedient remaining performance obligation		1 year		1 year
Finite live intangible assets amortization period				18 years
Maximum | Accounting Standards Update 2016-02 [Member] | Restatement Adjustment
Summary Of Significant Accounting Policies [Line Items]
Operating lease liabilities	350,000,000
Operating right-of-use assets	$ 300,000,000
Software and Software Development Costs [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Finite live intangible assets amortization period				7 years
Building and Building Improvements [Member] | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets				5 years
Building and Building Improvements [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets				40 years
Furniture and Fixtures [Member] | Minimum
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets				3 years
Furniture and Fixtures [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Useful life of assets				8 years
Adtalem Brazil [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary		97.90%		97.90%
Adtalem Brazil Senior Management Group [Member] | Adtalem Brazil [Member]
Summary Of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		2.10%		2.10%
Edupristine [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary		69.00%		69.00%
Ownership percentage held by minority available for purchase		33.00%		33.00%
Kaizen [Member] | Edupristine [Member]
Summary Of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		31.00%		31.00%
Dominica Campus [Member] | Ross University School of Medicine [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of Long-Lived Assets to be Disposed of				$ 39,100,000
Property, Plant and Equipment, Gross							$ 0
Forecast [Member] | Adtalem Brazil [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest of parent in subsidiary	100.00%