Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	Mar. 28, 2020	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Cost Method Investments	$ 9.4	$ 9.4

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

No definition available.

Name:	us-gaap_CostMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant