Segment and Geographic Information - Property and Equipment by Geographic Region (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Mar. 29, 2025	Sep. 28, 2024
Segment Reporting Information [Line Items]
Property and equipment, net	$ 123,706	$ 97,109
United States
Segment Reporting Information [Line Items]
Property and equipment, net	123,531	96,802
International
Segment Reporting Information [Line Items]
Property and equipment, net	$ 175	$ 307
Non-US \| Property, Plant and Equipment \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	0.00%	0.00%

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant