Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Unpaid Commitments For Construction and Acquisition Of Property and Equipment	$ 16.5	$ 15.7

Amounts representing unpaid commitments as of the balance sheet date under the terms of the commitments such as for construction or acquisition of property and equipment.

No definition available.

Name:	sdsp_UnpaidCommitmentsForConstructionAndAcquisitionOfPropertyAndEquipment
Namespace Prefix:	sdsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant