Inventories, Net - Narrative (Details) - USD ($) $ in Thousands	Mar. 27, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories at lower of LIFO cost or market	75.00%	72.00%
FIFO inventory amount	$ 1,938	$ 3,138
Excess and obsolete inventory reserve	$ 12,946	$ 14,295

Amount of valuation reserve for inventory.

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Name:	us-gaap_InventoryValuationReserves
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant