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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Changes in Carrying Amount of Allowance For Doubtful Accounts
Balance as of June 30, 2015
$
5,987

Bad debt expense
5,908

Write-off /adjustments
(5,155
)
Balance as of June 30, 2016
6,740

Bad debt expense
5,929

Write-off /adjustments
(6,350
)
Balance as of June 30, 2017
6,319

Bad debt expense
9,942

Write-off /adjustments
(6,520
)
Balance as of June 30, 2018
$
9,741