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Inventories - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
Inventory, raw materials, safe harbor | $ 84.5 | $ 349.5

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- Definition Inventory, Raw Materials, Safe Harbor + References No definition available. + Details
Name: | run_InventoryRawMaterialsSafeHarbor
Namespace Prefix: | run_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration