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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 of subsidiaries beneficially owns of outstanding common stock 10.00%