| Contingent Liabilities (Narrative) (Details) $ in Millions | 3 Months Ended | 
|---|---|
| Dec. 31, 2018  USD ($)  lawsuit | |
| Contingent Liabilities [Abstract] | |
| Loss contingency, range of possible loss, maximum | $ | $ 10.0 | 
| Number of class action lawsuits filed | lawsuit | 2 | 
| X | ||||||||||
| 
- References No definition available. 
 | 
| X | ||||||||||
| 
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| X | ||||||||||
| 
- Definition Number of class action lawsuits filed No definition available. 
 |