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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 |  |

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