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MARKETABLE SECURITIES - Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jun. 30, 2020
Amortized Cost    
Due within one year $ 512,121 $ 415,915
Due after one year through three years 477,132 325,459
Marketable securities, Amortized Cost 989,253 741,374
Fair Value    
Due within one year 513,136 418,169
Due after one year through three years 477,439 327,894
Marketable securities, Fair Value $ 990,575 $ 746,063