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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |
Impairment Charge | $ 1,007 | $ 500

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- Definition Inventory Impairment, Results of Discounted Cash Flow Analysis + References No definition available. + Details
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