Impairment of Long-Lived Assets and Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2020	Mar. 26, 2019	Mar. 31, 2020	Mar. 26, 2019
Goodwill and Intangible Asset Impairment [Abstract]
Balance as of September 24, 2019			$ 15,150
Impairment of Goodwill	$ (10,000)		(10,000)
Balance as of March 31, 2020	$ 5,150		$ 5,150

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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