Inventories, Net - Narrative (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories at lower of LIFO cost or market	72.00%	72.00%
FIFO inventory amount	$ (2,639)	$ (3,138)
Excess and obsolete inventory reserve	$ (15,140)	$ (14,295)

Amount of valuation reserve for inventory.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Name:	us-gaap_InventoryValuationReserves
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant