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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2016 | Mar. 31, 2018 | Sep. 30, 2017
Loss Contingencies [Line Items] |  |  |
Accounts receivable, net of allowance for doubtful accounts of $746 and $1,062 at March 31, 2018 and September 30, 2017, respectively |  | $ 127,151 | $ 152,299
Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency accrual |  | 1,200 |
Korea |  |  |
Loss Contingencies [Line Items] |  |  |
Income tax examination, estimate of possible loss | $ 12,000 |  |
Minimum | Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss |  | 1,200 |
Minimum | Customer Contracts |  |  |
Loss Contingencies [Line Items] |  |  |
Accounts receivable, net of allowance for doubtful accounts of $746 and $1,062 at March 31, 2018 and September 30, 2017, respectively |  | 0 |
Maximum | Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss |  | 3,400 |
Maximum | Customer Contracts |  |  |
Loss Contingencies [Line Items] |  |  |
Accounts receivable, net of allowance for doubtful accounts of $746 and $1,062 at March 31, 2018 and September 30, 2017, respectively |  | $ 17,300 |

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