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ALLOWANCE FOR DOUBTFUL ACCOUNTS - Changes In Carrying Amount (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance as of beginning of the period $ 17,011 $ 9,741 $ 6,319
Bad debt expense 11,461 13,461 9,942
Write-off /adjustments (7,566) (6,191) (6,520)
Balance as of end of the period 20,906 17,011 $ 9,741
Unbilled receivables $ 55,200 $ 56,100