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STOCK PLANS AND STOCK-BASED COMPENSATION - Summary of Activity Related to Restricted Stock and RSUs (Detail) - Restricted Stock Units - $ / shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Number of Shares      
Unvested restricted stock and RSUs Outstanding June 30 628,806 663,987 834,607
Granted 271,542 274,261 276,871
Vested (348,897) (276,626) (394,293)
Forfeited (49,528) (32,816) (53,198)
Unvested restricted stock and RSUs Outstanding June 30 501,923 628,806 663,987
Weighted Average Grant Date Fair Value      
Beginning balance unvested, June 30 $ 134.10 $ 107.96 $ 71.20
Granted 252.25 201.27 146.27
Vested 77.33 61.85 66.29
Forfeited 181.89 123.55 95.03
Ending balance unvested, June 30 $ 173.18 $ 134.10 $ 107.96