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Revenue - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jul. 01, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |
Change in deferred margin | $ 0 |  | $ (1,665)
Change in accounts receivable | (37,108) |  | (33,755)
Change in current accrued liabilities | 56,054 |  | $ 49,841
Accounting Standards Update 2014-09 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net increase to opening retained earnings |  | $ 1,000 |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Change in deferred margin | (1,691) | 1,600 |
Change in accounts receivable | (224) | 200 |
Change in current accrued liabilities | $ (120) | 100 |
Change in deferred tax assets |  | $ 300 |

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