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Income Taxes (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
USD ($)
Dec. 31, 2020
item
Dec. 31, 2019
Income Tax Contingency [Line Items]        
Effective Income Tax Rate Reconciliation, Percent 18.60% 85.30% 19.50% 37.60%
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]        
Loss on cash flow hedge | $   $ 28.0