Income Taxes Income Taxes (Details) $ in Millions	12 Months Ended
Sep. 30, 2019 USD ($)
Scenario, Forecast
Unrecognized tax benefits, expected decrease in the next twelve months resulting from expense related to certain acquisitions	$ 4.0

Amount of decrease in unrecognized tax benefits resulting from acquisitions.

No definition available.

Name:	us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromAcquisition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration