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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Net of Tax $ 1,391,530 $ 1,519,286 $ 1,669,039
Retained earnings 1,927,568 2,012,902  
Accumulated other comprehensive income reclassifications for realized loss on foreign currency translation adjustments (293,360) 0 0
Balance at the end of period - Net of Tax 1,310,421 1,391,530 1,519,286
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Net of Tax (137,290) (142,168) (59,119)
Accumulated other comprehensive income reclassifications for realized loss on foreign currency translation adjustments (293,360)    
Balance at the end of period - Net of Tax (9,055) (137,290) (142,168)
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Net of Tax (137,389) (142,574) (59,400)
Other comprehensive income (loss) - Gross (157,354) 5,185 (83,174)
Accumulated other comprehensive income reclassifications for realized loss on foreign currency translation adjustments 293,360    
Balance at the end of period - Net of Tax (1,383) (137,389) (142,574)
Marketable Securities.      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Gross 131 537 454
Balance at the beginning of period - Tax (32) (131) (173)
Balance at the beginning of period - Net of Tax 99 406 281
Other comprehensive income (loss) - Gross 111 98 83
Other comprehensive income (loss) - Tax (27) (24) 42
Balance at the end of period - Net of Tax 183 99 406
Interest Rate Swap      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) - Gross (10,399)    
Other comprehensive income (loss) - Tax 2,544    
Balance at the end of period - Net of Tax (7,855)    
Cumulative Effect, Period of Adoption, Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Net of Tax   (236)  
Balance at the end of period - Net of Tax     $ (236)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Net of Tax (381)    
Balance at the end of period - Net of Tax   (381)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Marketable Securities.      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at the beginning of period - Net of Tax (381)    
Balance at the end of period - Net of Tax   $ (381)  
Discontinued Operations, Disposed of by Sale | Adtalem Educacional Do Brasil [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income reclassifications for realized loss on foreign currency translation adjustments $ 293,400