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Fair Value Measurements (Details)				12 Months Ended
	Jul. 29, 2021 USD ($)	Jul. 31, 2019 USD ($)	Dec. 11, 2018 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, gross				$ 1,091,000,000	$ 294,000,000
Gain (Loss) on Derivative Instruments, Net, Pretax				0	110,723,000	$ 0
Assets measured at fair value using Level 3				0	0
Liabilities measured at fair value using Level 3				0	0
Accounts Receivable | Credit extension program
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure				29,200,000	34,300,000
Nonqualified Deferred Compensation Plan [Member] | Investment in Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets, Fair Value Disclosure				20,600,000	9,000,000.0
Nonqualified Deferred Compensation Plan [Member] | Accrued Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Liability, Current, Fair Value Disclosure				$ 20,300,000	$ 17,600,000
DeVry University [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivable with Imputed Interest, Face Amount			$ 10,000,000.0
Receivable with Imputed Interest, Effective Yield (Interest Rate)			4.00%
Receivable with Imputed Interest, Due Date			Jan. 01, 2022
DeVry University [Member] | Discount rate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input				0.04	0.04
DeVry University [Member] | Prepaid Expenses and Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure				$ 10,000,000.0	$ 10,000,000.0
Chicago, Illinois Campus [Member] | Discontinued Operations, Disposed of by Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure				$ 42,700,000	41,400,000
Receivable with Imputed Interest, Face Amount		$ 46,800,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)		4.00%
Receivable with Imputed Interest, Due Date		Jul. 31, 2024
Interest Rate		4.00%
Chicago, Illinois Campus [Member] | Discount rate | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input				0.07
Chicago, Illinois Campus [Member] | Other Noncurrent Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure				$ 42,700,000	41,400,000
Adtalem Educational Do Brazil [Member] | Discontinued Operations, Disposed of by Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax				110,700,000
Interest Rate Swap | Interest Expense [Member] | Subsequent Event [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (4,500,000)
Interest Rate Swap | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability				$ 8,900,000	$ 10,400,000

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The fair value amount as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Yield on the receivable, on which interest has been imputed, as calculated from its issuance value or purchase price. The calculated effective interest rate considers factors such as the issued face value or price paid for the receivable, the time period between payments, and the time until maturity [full receipt] of the receivable.

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