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Related Parties (Narrative) (Details) - Jefferies [Member] € in Millions, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |
Fees and reimbursements of expenses from related party | $ 3.0 |  |
One Of The Initial Purchasers For SBI [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Offering amount from related party | € |  | € 425 |
Interest rate |  | 4.00% | 4.00%
Maturity year |  | 2026 | 2026
Discounts, commissions and reimbursements of expenses from related party |  |  | $ 0.3
Minimum [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage beneficially owns of common stock | 10.00% |  |

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