Expense Example	Aug. 01, 2026 USD ($)
Absolute CEF Opportunities \| Absolute CEF Opportunities INSTITUTIONAL SHARES
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 794
Expense Example, with Redemption, 3 Years	2,721
Expense Example, with Redemption, 5 Years	4,441
Expense Example, with Redemption, 10 Years	7,978
ABSOLUTE CONVERTIBLE ARBITRAGE FUND \| ABSOLUTE CONVERTIBLE ARBITRAGE FUND INSTITUTIONAL SHARES
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	138
Expense Example, with Redemption, 3 Years	431
Expense Example, with Redemption, 5 Years	745
Expense Example, with Redemption, 10 Years	1,635
ABSOLUTE CONVERTIBLE ARBITRAGE FUND \| ABSOLUTE CONVERTIBLE ARBITRAGE FUND INVESTOR SHARES
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	164
Expense Example, with Redemption, 3 Years	508
Expense Example, with Redemption, 5 Years	876
Expense Example, with Redemption, 10 Years	1,911
ABSOLUTE FLEXIBLE FUND \| ABSOLUTE FLEXIBLE FUND INSTITUTIONAL SHARES
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	154
Expense Example, with Redemption, 3 Years	591
Expense Example, with Redemption, 5 Years	1,054
Expense Example, with Redemption, 10 Years	$ 2,336

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear01
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear03
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear05
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection instruction
-Paragraph 4

Name:	oef_ExpenseExampleYear10
Namespace Prefix:	oef_
Data Type:	dtr-types:nonNegativeMonetaryItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a

Name:	dei_LegalEntityAxis=ust_S000081741Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=ust_S000081739Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=ust_S000081740Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: