Ubs Investment Trust N-CSR12 Nov 24Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Aug. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	UBS Investment Trust
Entity Central Index Key	0000873803
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
Shareholder Report	Aug. 31, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	UBS Investment Trust
Entity Central Index Key	0000873803
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024
C000006689
Shareholder Report [Line Items]
Fund Name	UBS U.S. Allocation Fund
Class Name	Class A
Trading Symbol	PWTAX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about UBS U.S. Allocation Fund for the period of September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual	Annual Shareholder Report
Additional Information [Text Block]	You can find additional information about the Fund at http://www.ubs.com/port-info
Additional Information Phone Number	1-800-647-1568
Expenses [Text Block]	What were the Fund costs for the last year? Annual Fund Operating Expenses (based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $112 1.03%
Expenses Paid, Amount	$ 112
Expense Ratio, Percent	1.03%
Performance Past Does Not Indicate Future [Text]	Performance data represents past performance, which does not guarantee future results.</p>" id="sjs-B22"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">Performance data represents past performance, which does not guarantee future results.</p>
Line Graph [Table Text Block]	Class A with Load S&P 500 Index 8/31/2014 $9,450 $10,000 9/30/2014 $9,272 $9,860 10/31/2014 $9,464 $10,101 11/30/2014 $9,623 $10,372 12/31/2014 $9,630 $10,346 1/31/2015 $9,502 $10,036 2/28/2015 $9,899 $10,612 3/31/2015 $9,844 $10,444 4/30/2015 $9,837 $10,545 5/31/2015 $9,927 $10,680 6/30/2015 $9,804 $10,474 7/31/2015 $9,972 $10,693 8/31/2015 $9,557 $10,048 9/30/2015 $9,269 $9,799 10/31/2015 $9,816 $10,626 11/30/2015 $9,927 $10,657 12/31/2015 $9,725 $10,489 1/31/2016 $9,262 $9,969 2/29/2016 $9,219 $9,955 3/31/2016 $9,668 $10,631 4/30/2016 $9,730 $10,672 5/31/2016 $9,837 $10,864 6/30/2016 $9,818 $10,892 7/31/2016 $10,181 $11,293 8/31/2016 $10,229 $11,309 9/30/2016 $10,269 $11,311 10/31/2016 $10,070 $11,105 11/30/2016 $10,229 $11,516 12/31/2016 $10,332 $11,744 1/31/2017 $10,577 $11,967 2/28/2017 $10,861 $12,442 3/31/2017 $10,892 $12,456 4/30/2017 $10,997 $12,584 5/31/2017 $11,112 $12,761 6/30/2017 $11,188 $12,841 7/31/2017 $11,334 $13,105 8/31/2017 $11,357 $13,145 9/30/2017 $11,520 $13,416 10/31/2017 $11,632 $13,729 11/30/2017 $11,851 $14,150 12/31/2017 $11,927 $14,308 1/31/2018 $12,298 $15,127 2/28/2018 $11,956 $14,569 3/31/2018 $11,822 $14,199 4/30/2018 $11,763 $14,254 5/31/2018 $12,037 $14,597 6/30/2018 $12,049 $14,687 7/31/2018 $12,286 $15,233 8/31/2018 $12,520 $15,730 9/30/2018 $12,454 $15,819 10/31/2018 $11,658 $14,738 11/30/2018 $11,795 $15,038 12/31/2018 $10,985 $13,680 1/31/2019 $11,836 $14,777 2/28/2019 $12,180 $15,251 3/31/2019 $12,314 $15,547 4/30/2019 $12,715 $16,177 5/31/2019 $12,147 $15,149 6/30/2019 $12,737 $16,217 7/31/2019 $12,851 $16,450 8/31/2019 $12,625 $16,189 9/30/2019 $12,753 $16,492 10/31/2019 $12,971 $16,849 11/30/2019 $13,291 $17,461 12/31/2019 $13,558 $17,988 1/31/2020 $13,616 $17,981 2/29/2020 $12,954 $16,501 3/31/2020 $11,587 $14,463 4/30/2020 $12,659 $16,317 5/31/2020 $13,149 $17,094 6/30/2020 $13,469 $17,434 7/31/2020 $14,109 $18,417 8/31/2020 $14,727 $19,740 9/30/2020 $14,387 $18,990 10/31/2020 $14,329 $18,485 11/30/2020 $15,592 $20,509 12/31/2020 $16,121 $21,297 1/31/2021 $16,065 $21,082 2/28/2021 $16,527 $21,664 3/31/2021 $16,691 $22,612 4/30/2021 $17,389 $23,819 5/31/2021 $17,389 $23,986 6/30/2021 $17,621 $24,546 7/31/2021 $17,785 $25,129 8/31/2021 $18,021 $25,893 9/30/2021 $17,538 $24,688 10/31/2021 $18,390 $26,418 11/30/2021 $18,194 $26,235 12/31/2021 $18,712 $27,411 1/31/2022 $17,882 $25,992 2/28/2022 $17,668 $25,214 3/31/2022 $17,899 $26,150 4/30/2022 $16,613 $23,870 5/31/2022 $16,623 $23,914 6/30/2022 $15,522 $21,940 7/31/2022 $16,521 $23,963 8/31/2022 $15,915 $22,986 9/30/2022 $14,706 $20,869 10/31/2022 $15,463 $22,558 11/30/2022 $16,122 $23,819 12/31/2022 $15,496 $22,446 1/31/2023 $16,406 $23,857 2/28/2023 $16,039 $23,275 3/31/2023 $16,205 $24,129 4/30/2023 $16,352 $24,506 5/31/2023 $16,394 $24,612 6/30/2023 $17,084 $26,239 7/31/2023 $17,538 $27,082 8/31/2023 $17,303 $26,650 9/30/2023 $16,540 $25,380 10/31/2023 $16,113 $24,846 11/30/2023 $17,342 $27,115 12/31/2023 $18,192 $28,347 1/31/2024 $18,266 $28,824 2/29/2024 $18,848 $30,363 3/31/2024 $19,309 $31,339 4/30/2024 $18,465 $30,059 5/31/2024 $19,130 $31,550 6/30/2024 $19,481 $32,682 7/31/2024 $19,864 $33,080 8/31/2024 $20,239 $33,882
Average Annual Return [Table Text Block]	1 Year 5 Years 10 Years Class A 16.97% 9.90% 7.91% Class A with Load 10.55% 8.66% 7.30% S&P 500 Index 27.14% 15.92% 12.98%
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or a redemption of Fund shares.
AssetsNet	$ 229,345,180
Holdings Count \| Holding	1,053
Advisory Fees Paid, Amount	$ 1,092,819
InvestmentCompanyPortfolioTurnover	58%
Additional Fund Statistics [Text Block]	Key Fund Statistics FUND STATISTICS Total Net Assets $229,345,180 # of Portfolio Holdings 1,053 Portfolio Turnover Rate 58% Total Advisory Fees Paid (includes Administration Fees) $1,092,819
Holdings [Text Block]	Top 5 Equity Holdings (%) Apple, Inc. 4.2% Microsoft Corp. 4.0 NVIDIA Corp. 3.8 Alphabet, Inc., Class A 2.3 Amazon.com, Inc. 2.2
Largest Holdings [Text Block]	Top 5 Holdings (other than equities) (%) Invesco S&P 500 Equal Weight ETF 2.0% Uniform Mortgage-Backed Security, TBA , 2.000% 1.7 Uniform Mortgage-Backed Security, TBA , 4.500% 1.3 iShares Core S&P Mid-Cap ETF 1.2 Uniform Mortgage-Backed Security, TBA , 5.000% 1.2
Material Fund Change [Text Block]
C000006692
Shareholder Report [Line Items]
Fund Name	UBS U.S. Allocation Fund
Class Name	Class P
Trading Symbol	PWTYX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about UBS U.S. Allocation Fund for the period of September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual	Annual Shareholder Report
Additional Information [Text Block]	You can find additional information about the Fund at http://www.ubs.com/port-info
Additional Information Phone Number	1-800-647-1568
Expenses [Text Block]	What were the Fund costs for the last year? Annual Fund Operating Expenses (based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class P $83 0.76%
Expenses Paid, Amount	$ 83
Expense Ratio, Percent	0.76%
Performance Past Does Not Indicate Future [Text]	Performance data represents past performance, which does not guarantee future results.</p>" id="sjs-B46"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">Performance data represents past performance, which does not guarantee future results.</p>
Line Graph [Table Text Block]	Class P S&P 500 Index 8/31/2014 $10,000 $10,000 9/30/2014 $9,815 $9,860 10/31/2014 $10,020 $10,101 11/30/2014 $10,190 $10,372 12/31/2014 $10,200 $10,346 1/31/2015 $10,066 $10,036 2/28/2015 $10,488 $10,612 3/31/2015 $10,433 $10,444 4/30/2015 $10,428 $10,545 5/31/2015 $10,527 $10,680 6/30/2015 $10,398 $10,474 7/31/2015 $10,580 $10,693 8/31/2015 $10,140 $10,048 9/30/2015 $9,835 $9,799 10/31/2015 $10,421 $10,626 11/30/2015 $10,540 $10,657 12/31/2015 $10,326 $10,489 1/31/2016 $9,837 $9,969 2/29/2016 $9,795 $9,955 3/31/2016 $10,277 $10,631 4/30/2016 $10,344 $10,672 5/31/2016 $10,458 $10,864 6/30/2016 $10,441 $10,892 7/31/2016 $10,830 $11,293 8/31/2016 $10,882 $11,309 9/30/2016 $10,927 $11,311 10/31/2016 $10,719 $11,105 11/30/2016 $10,890 $11,516 12/31/2016 $11,001 $11,744 1/31/2017 $11,266 $11,967 2/28/2017 $11,571 $12,442 3/31/2017 $11,606 $12,456 4/30/2017 $11,723 $12,584 5/31/2017 $11,846 $12,761 6/30/2017 $11,931 $12,841 7/31/2017 $12,088 $13,105 8/31/2017 $12,118 $13,145 9/30/2017 $12,293 $13,416 10/31/2017 $12,413 $13,729 11/30/2017 $12,653 $14,150 12/31/2017 $12,737 $14,308 1/31/2018 $13,135 $15,127 2/28/2018 $12,771 $14,569 3/31/2018 $12,632 $14,199 4/30/2018 $12,571 $14,254 5/31/2018 $12,866 $14,597 6/30/2018 $12,881 $14,687 7/31/2018 $13,137 $15,233 8/31/2018 $13,393 $15,730 9/30/2018 $13,324 $15,819 10/31/2018 $12,476 $14,738 11/30/2018 $12,625 $15,038 12/31/2018 $11,762 $13,680 1/31/2019 $12,676 $14,777 2/28/2019 $13,046 $15,251 3/31/2019 $13,192 $15,547 4/30/2019 $13,622 $16,177 5/31/2019 $13,020 $15,149 6/30/2019 $13,653 $16,217 7/31/2019 $13,779 $16,450 8/31/2019 $13,539 $16,189 9/30/2019 $13,682 $16,492 10/31/2019 $13,920 $16,849 11/30/2019 $14,264 $17,461 12/31/2019 $14,555 $17,988 1/31/2020 $14,619 $17,981 2/29/2020 $13,913 $16,501 3/31/2020 $12,446 $14,463 4/30/2020 $13,603 $16,317 5/31/2020 $14,133 $17,094 6/30/2020 $14,479 $17,434 7/31/2020 $15,170 $18,417 8/31/2020 $15,838 $19,740 9/30/2020 $15,478 $18,990 10/31/2020 $15,416 $18,485 11/30/2020 $16,778 $20,509 12/31/2020 $17,355 $21,297 1/31/2021 $17,299 $21,082 2/28/2021 $17,798 $21,664 3/31/2021 $17,977 $22,612 4/30/2021 $18,734 $23,819 5/31/2021 $18,740 $23,986 6/30/2021 $18,992 $24,546 7/31/2021 $19,174 $25,129 8/31/2021 $19,431 $25,893 9/30/2021 $18,916 $24,688 10/31/2021 $19,840 $26,418 11/30/2021 $19,632 $26,235 12/31/2021 $20,195 $27,411 1/31/2022 $19,303 $25,992 2/28/2022 $19,074 $25,214 3/31/2022 $19,332 $26,150 4/30/2022 $17,946 $23,870 5/31/2022 $17,961 $23,914 6/30/2022 $16,777 $21,940 7/31/2022 $17,857 $23,963 8/31/2022 $17,208 $22,986 9/30/2022 $15,903 $20,869 10/31/2022 $16,729 $22,558 11/30/2022 $17,441 $23,819 12/31/2022 $16,769 $22,446 1/31/2023 $17,758 $23,857 2/28/2023 $17,361 $23,275 3/31/2023 $17,547 $24,129 4/30/2023 $17,709 $24,506 5/31/2023 $17,762 $24,612 6/30/2023 $18,512 $26,239 7/31/2023 $19,007 $27,082 8/31/2023 $18,760 $26,650 9/30/2023 $17,937 $25,380 10/31/2023 $17,478 $24,846 11/30/2023 $18,808 $27,115 12/31/2023 $19,741 $28,347 1/31/2024 $19,823 $28,824 2/29/2024 $20,462 $30,363 3/31/2024 $20,964 $31,339 4/30/2024 $20,054 $30,059 5/31/2024 $20,779 $31,550 6/30/2024 $21,166 $32,682 7/31/2024 $21,587 $33,080 8/31/2024 $22,003 $33,882
Average Annual Return [Table Text Block]	1 Year 5 Years 10 Years Class P 17.29% 10.20% 8.21% S&P 500 Index 27.14% 15.92% 12.98%
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or a redemption of Fund shares.
AssetsNet	$ 229,345,180
Holdings Count \| Holding	1,053
Advisory Fees Paid, Amount	$ 1,092,819
InvestmentCompanyPortfolioTurnover	58%
Additional Fund Statistics [Text Block]	Key Fund Statistics FUND STATISTICS Total Net Assets $229,345,180 # of Portfolio Holdings 1,053 Portfolio Turnover Rate 58% Total Advisory Fees Paid (includes Administration Fees) $1,092,819
Holdings [Text Block]	Top 5 Equity Holdings (%) Apple, Inc. 4.2% Microsoft Corp. 4.0 NVIDIA Corp. 3.8 Alphabet, Inc., Class A 2.3 Amazon.com, Inc. 2.2
Largest Holdings [Text Block]	Top 5 Holdings (other than equities) (%) Invesco S&P 500 Equal Weight ETF 2.0% Uniform Mortgage-Backed Security, TBA , 2.000% 1.7 Uniform Mortgage-Backed Security, TBA , 4.500% 1.3 iShares Core S&P Mid-Cap ETF 1.2 Uniform Mortgage-Backed Security, TBA , 5.000% 1.2
Material Fund Change [Text Block]

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	12 Months Ended
Shareholder Report, Line Graph (Details) - USD ($)	Aug. 31, 2024	Jul. 31, 2024	Jun. 30, 2024	May 31, 2024	Apr. 30, 2024	Mar. 31, 2024	Feb. 29, 2024	Jan. 31, 2024	Dec. 31, 2023	Nov. 30, 2023	Oct. 31, 2023	Sep. 30, 2023	Aug. 31, 2023	Jul. 31, 2023	Jun. 30, 2023	May 31, 2023	Apr. 30, 2023	Mar. 31, 2023	Feb. 28, 2023	Jan. 31, 2023	Dec. 31, 2022	Nov. 30, 2022	Oct. 31, 2022	Sep. 30, 2022	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Mar. 31, 2022	Feb. 28, 2022	Jan. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Oct. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Dec. 31, 2020	Nov. 30, 2020	Oct. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Dec. 31, 2019	Nov. 30, 2019	Oct. 31, 2019	Sep. 30, 2019	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jan. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Jul. 31, 2018	Jun. 30, 2018	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Jan. 31, 2018	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 31, 2016	Nov. 30, 2016	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2016	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Dec. 31, 2015	Nov. 30, 2015	Oct. 31, 2015	Sep. 30, 2015	Aug. 31, 2015	Jul. 31, 2015	Jun. 30, 2015	May 31, 2015	Apr. 30, 2015	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Oct. 31, 2014	Sep. 30, 2014	Aug. 31, 2014
C000006689
Account Value [Line Items]
Line Graph and Table Measure Name	Class A with Load
Account Value	$ 20,239	$ 19,864	$ 19,481	$ 19,130	$ 18,465	$ 19,309	$ 18,848	$ 18,266	$ 18,192	$ 17,342	$ 16,113	$ 16,540	$ 17,303	$ 17,538	$ 17,084	$ 16,394	$ 16,352	$ 16,205	$ 16,039	$ 16,406	$ 15,496	$ 16,122	$ 15,463	$ 14,706	$ 15,915	$ 16,521	$ 15,522	$ 16,623	$ 16,613	$ 17,899	$ 17,668	$ 17,882	$ 18,712	$ 18,194	$ 18,390	$ 17,538	$ 18,021	$ 17,785	$ 17,621	$ 17,389	$ 17,389	$ 16,691	$ 16,527	$ 16,065	$ 16,121	$ 15,592	$ 14,329	$ 14,387	$ 14,727	$ 14,109	$ 13,469	$ 13,149	$ 12,659	$ 11,587	$ 12,954	$ 13,616	$ 13,558	$ 13,291	$ 12,971	$ 12,753	$ 12,625	$ 12,851	$ 12,737	$ 12,147	$ 12,715	$ 12,314	$ 12,180	$ 11,836	$ 10,985	$ 11,795	$ 11,658	$ 12,454	$ 12,520	$ 12,286	$ 12,049	$ 12,037	$ 11,763	$ 11,822	$ 11,956	$ 12,298	$ 11,927	$ 11,851	$ 11,632	$ 11,520	$ 11,357	$ 11,334	$ 11,188	$ 11,112	$ 10,997	$ 10,892	$ 10,861	$ 10,577	$ 10,332	$ 10,229	$ 10,070	$ 10,269	$ 10,229	$ 10,181	$ 9,818	$ 9,837	$ 9,730	$ 9,668	$ 9,219	$ 9,262	$ 9,725	$ 9,927	$ 9,816	$ 9,269	$ 9,557	$ 9,972	$ 9,804	$ 9,927	$ 9,837	$ 9,844	$ 9,899	$ 9,502	$ 9,630	$ 9,623	$ 9,464	$ 9,272	$ 9,450
C000006692
Account Value [Line Items]
Line Graph and Table Measure Name	Class P
UBS Index: S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name	S&P 500 Index
Account Value	$ 33,882	33,080	32,682	31,550	30,059	31,339	30,363	28,824	28,347	27,115	24,846	25,380	26,650	27,082	26,239	24,612	24,506	24,129	23,275	23,857	22,446	23,819	22,558	20,869	22,986	23,963	21,940	23,914	23,870	26,150	25,214	25,992	27,411	26,235	26,418	24,688	25,893	25,129	24,546	23,986	23,819	22,612	21,664	21,082	21,297	20,509	18,485	18,990	19,740	18,417	17,434	17,094	16,317	14,463	16,501	17,981	17,988	17,461	16,849	16,492	16,189	16,450	16,217	15,149	16,177	15,547	15,251	14,777	13,680	15,038	14,738	15,819	15,730	15,233	14,687	14,597	14,254	14,199	14,569	15,127	14,308	14,150	13,729	13,416	13,145	13,105	12,841	12,761	12,584	12,456	12,442	11,967	11,744	11,516	11,105	11,311	11,309	11,293	10,892	10,864	10,672	10,631	9,955	9,969	10,489	10,657	10,626	9,799	10,048	10,693	10,474	10,680	10,545	10,444	10,612	10,036	10,346	10,372	10,101	9,860	10,000
UBS Index: S&P 500 Index
Account Value [Line Items]
Line Graph and Table Measure Name	S&P 500 Index
Account Value	$ 33,882	$ 33,080	$ 32,682	$ 31,550	$ 30,059	$ 31,339	$ 30,363	$ 28,824	$ 28,347	$ 27,115	$ 24,846	$ 25,380	$ 26,650	$ 27,082	$ 26,239	$ 24,612	$ 24,506	$ 24,129	$ 23,275	$ 23,857	$ 22,446	$ 23,819	$ 22,558	$ 20,869	$ 22,986	$ 23,963	$ 21,940	$ 23,914	$ 23,870	$ 26,150	$ 25,214	$ 25,992	$ 27,411	$ 26,235	$ 26,418	$ 24,688	$ 25,893	$ 25,129	$ 24,546	$ 23,986	$ 23,819	$ 22,612	$ 21,664	$ 21,082	$ 21,297	$ 20,509	$ 18,485	$ 18,990	$ 19,740	$ 18,417	$ 17,434	$ 17,094	$ 16,317	$ 14,463	$ 16,501	$ 17,981	$ 17,988	$ 17,461	$ 16,849	$ 16,492	$ 16,189	$ 16,450	$ 16,217	$ 15,149	$ 16,177	$ 15,547	$ 15,251	$ 14,777	$ 13,680	$ 15,038	$ 14,738	$ 15,819	$ 15,730	$ 15,233	$ 14,687	$ 14,597	$ 14,254	$ 14,199	$ 14,569	$ 15,127	$ 14,308	$ 14,150	$ 13,729	$ 13,416	$ 13,145	$ 13,105	$ 12,841	$ 12,761	$ 12,584	$ 12,456	$ 12,442	$ 11,967	$ 11,744	$ 11,516	$ 11,105	$ 11,311	$ 11,309	$ 11,293	$ 10,892	$ 10,864	$ 10,672	$ 10,631	$ 9,955	$ 9,969	$ 10,489	$ 10,657	$ 10,626	$ 9,799	$ 10,048	$ 10,693	$ 10,474	$ 10,680	$ 10,545	$ 10,444	$ 10,612	$ 10,036	$ 10,346	$ 10,372	$ 10,101	$ 9,860	$ 10,000

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	12 Months Ended	60 Months Ended	120 Months Ended
Shareholder Report, Average Annual Return (Details)	Aug. 31, 2024	Aug. 31, 2024	Aug. 31, 2024
C000006689
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Class A with Load
Average Annual Return, Percent	10.55%	8.66%	7.30%
C000006692
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Class P
Without Sales Load [Member] \| C000006689
Average Annual Return [Line Items]
Average Annual Return, Percent	16.97%	9.90%	7.91%
Without Sales Load [Member] \| C000006692
Average Annual Return [Line Items]
Average Annual Return, Percent	17.29%	10.20%	8.21%
UBS Index: S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	S&P 500 Index
Average Annual Return, Percent	27.14%	15.92%	12.98%
UBS Index: S&P 500 Index
Average Annual Return [Line Items]
Line Graph and Table Measure Name	S&P 500 Index
Average Annual Return, Percent	27.14%	15.92%	12.98%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Aug. 31, 2024
C000006689 \| Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000006689 \| Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	4%
C000006689 \| NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000006689 \| Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000006689 \| Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000006689 \| Invesco S&P 500 Equal Weight ETFFR_46137V357
Holdings [Line Items]
Percent of Net Asset Value	2%
C000006689 \| Uniform Mortgage-Backed Security, TBAFR_01F020695
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000006689 \| Uniform Mortgage-Backed Security, TBAFR_01F042699
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000006689 \| iShares Core S&P Mid-Cap ETFFR_464287507
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000006689 \| Uniform Mortgage-Backed Security, TBAFR_01F050692
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000006692 \| Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000006692 \| Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	4%
C000006692 \| NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000006692 \| Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000006692 \| Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000006692 \| Invesco S&P 500 Equal Weight ETFFR_46137V357
Holdings [Line Items]
Percent of Net Asset Value	2%
C000006692 \| Uniform Mortgage-Backed Security, TBAFR_01F020695
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000006692 \| Uniform Mortgage-Backed Security, TBAFR_01F042699
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000006692 \| iShares Core S&P Mid-Cap ETFFR_464287507
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000006692 \| Uniform Mortgage-Backed Security, TBAFR_01F050692
Holdings [Line Items]
Percent of Net Asset Value	1.20%