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Summary of Significant Accounting Policies - Inventory and Cash and Cash Equivalents and Cash Concentrations (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Inventory [Line Items] |  |
Inventory, net | $ 179,355 | $ 166,997
Mexico | Foreign | Reportable geographical components |  |
Inventory [Line Items] |  |
Inventory, net | $ 26,900 | $ 25,100

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