Fair Value Measurements (Details)					3 Months Ended
	Jul. 29, 2021 USD ($)	Jul. 31, 2019 USD ($)	Dec. 11, 2018 USD ($)	Dec. 11, 2018 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, gross					$ 1,650,000,000	$ 1,091,000,000	$ 293,250,000
Assets measured at fair value using Level 3					0	0	0
Liabilities measured at fair value using Level 3					0	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					28,700,000	29,200,000	33,000,000.0
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					20,500,000	20,600,000	9,400,000
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					$ 20,700,000	20,300,000	18,200,000
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	$ 10,000,000.0
Receivable with Imputed Interest, Effective Yield (Interest Rate)			4.00%	4.00%
Receivable with Imputed Interest, Due Date			Jan. 01, 2022	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
DeVry University [Member] | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure							10,000,000
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					$ 43,000,000.0	42,700,000	41,700,000
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
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					$ 43,000,000.0	42,700,000	41,700,000
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax					$ (4,525,000)
Interest Rate Swap | Interest Expense [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	$ 10,200,000