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Allowance for Doubtful Accounts - Changes In Carrying Amount (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2018
Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance as of June 30, 2017 $ 6,319  
Bad debt expense 6,561  
Write-off /adjustments (3,873)  
Balance as of March 31, 2018 9,007  
Unbilled receivables $ 58,200 $ 46,200