Shareholder Report, Line Graph (Details) - USD ($)			6 Months Ended	12 Months Ended		18 Months Ended	24 Months Ended	30 Months Ended	36 Months Ended	42 Months Ended	48 Months Ended	54 Months Ended	60 Months Ended	66 Months Ended	72 Months Ended	78 Months Ended	84 Months Ended	90 Months Ended	96 Months Ended	102 Months Ended	108 Months Ended	120 Months Ended
Shareholder Report, Line Graph (Details) - USD ($)	Feb. 16, 2018	Aug. 31, 2016	Aug. 31, 2018	Aug. 31, 2026	Aug. 31, 2017	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2026
C000023137
Account Value [Line Items]
Line Graph and Table Measure Name				Morgan Stanley Pathway Large Cap Equity ETF
Accumulated Value		$ 10,000			$ 11,386		$ 13,537		$ 13,716		$ 16,301		$ 21,483		$ 18,166		$ 20,839		$ 25,958		$ 29,772	$ 34,772
C000023141
Account Value [Line Items]
Line Graph and Table Measure Name				Morgan Stanley Pathway Small-Mid Cap Equity ETF
Accumulated Value		10,000			11,449		13,987		13,113		14,264		20,132		16,932		18,028		20,766		22,360	27,540
C000023143
Account Value [Line Items]
Line Graph and Table Measure Name				International Equity Fund
Accumulated Value		10,000			11,714		12,200		11,427		12,414		16,006		12,586		15,320		18,132		20,224	24,322
C000023144
Account Value [Line Items]
Line Graph and Table Measure Name				Emerging Markets Equity Fund
Accumulated Value		10,000			12,548		11,845		11,797		12,598		15,280		11,317		11,842		13,413		15,503	21,650
C000023145
Account Value [Line Items]
Line Graph and Table Measure Name				Core Fixed Income Fund
Accumulated Value		10,000			10,107		9,971		11,006		11,827		11,896		10,367		10,201		10,912		11,242	11,457
C000023146
Account Value [Line Items]
Line Graph and Table Measure Name				High Yield Fund
Accumulated Value		10,000			10,838		11,214		11,840		11,856		12,876		11,476		12,245		13,588		14,655	15,204
C000023147
Account Value [Line Items]
Line Graph and Table Measure Name				International Fixed Income Fund
Accumulated Value		10,000			10,098		10,326		11,359		11,445		11,657		10,312		10,296		11,001		11,413	11,432
C000023138
Account Value [Line Items]
Line Graph and Table Measure Name				Municipal Bond Fund
Accumulated Value		10,000			9,978		9,956		10,790		11,005		11,343		10,332		10,472		11,102		10,997	11,443
C000164312
Account Value [Line Items]
Line Graph and Table Measure Name				Inflation-Linked Fixed Income Fund
Accumulated Value		10,000			10,105		10,160		10,813		11,935		12,636		11,831		11,297		12,025		12,661	12,768
C000164313
Account Value [Line Items]
Line Graph and Table Measure Name				Ultra-Short Term Fixed Income Fund
Accumulated Value		$ 10,000			$ 10,214		$ 10,427		$ 10,643		$ 10,895		$ 10,961		$ 10,860		$ 11,397		$ 12,113		$ 12,747	$ 13,323
C000196891
Account Value [Line Items]
Line Graph and Table Measure Name				Alternative Strategies Fund
Accumulated Value	$ 10,000		$ 9,880			$ 10,167		$ 10,432		$ 11,516		$ 11,268		$ 11,509		$ 12,505		$ 12,918		$ 13,963