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Allowance for Doubtful Accounts - Changes In Carrying Amount (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance as of beginning of the period $ 9,741  
Bad debt expense 11,096  
Write-off /adjustments (3,891)  
Balance as of end of the period 16,946  
Unbilled receivables $ 59,700 $ 55,500