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Intangible Assets Intangible Asset Additions (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |
Finite-lived Intangible Assets Acquired | $ 1.4

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + Details
Name: | us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration