Income Taxes (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020 USD ($)	Mar. 31, 2021 item	Mar. 31, 2020 USD ($)
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	19.80%	4.30%	19.60%	9.60%
Number of operating units benefit from local tax incentives | item			3
U.S. federal corporate tax rate			21.00%	21.00%
Discontinued Operations, Disposed of by Sale | Adtalem Educational Do Brazil [Member]
Income Tax Contingency [Line Items]
Gain on cash flow hedge | $		$ 111.8		$ 83.8