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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENT OF EQUITY      
Redeemable noncontrolling interest related to LearnBop $ 0.2 $ 0.9 $ 0.5