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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName Starboard Investment Trust
Central Index Key dei_EntityCentralIndexKey 0001464413
Arin Large Cap Theta Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Arin Large Cap Theta Fund
Supplement To Prospectus [Text Block] rr_SupplementToProspectusTextBlock
ARIN LARGE CAP THETA FUND
 
Supplement to the Prospectus and Summary Prospectus
 
July 29, 2019
This supplement to the Prospectus and Summary Prospectus each dated July 1, 2019, for the Arin Large Cap Theta Fund (the “Fund”), a series of the Starboard Investment Trust (the “Trust”), updates the information described below. For further information, please contact the Fund toll-free at 1-800-773-3863. You may obtain copies of the Prospectus, Summary Prospectus, and Statement of Additional Information, free of charge, by writing to the Fund at Post Office Box 4365, Rocky Mount, North Carolina 27803, or calling the Fund toll-free at the number above.
The table entitled “Annual Fund Operating Expenses” is replaced in its entirety with the following:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-773-3863
Supplement Closing To Prospectus [Text Block] sit_SupplementClosingToProspectusTextBlock
Investors Should Retain This Supplement for Future Reference
Arin Large Cap Theta Fund | Institutional  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.40%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.28%
Interest Expense on Margin sit_InterestExpenseOnMargin 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.83%
Arin Large Cap Theta Fund | Advisor  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.40%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.40%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Interest Expense on Margin sit_InterestExpenseOnMargin 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.23%