v3.26.1
Label Element Value
Western Asset SMASh Series Core Plus Completion Fund | Mortgage-Backed Securities [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 32.10%
Western Asset SMASh Series Core Plus Completion Fund | Collateralized Mortgage Obligations [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 17.60%
Western Asset SMASh Series Core Plus Completion Fund | Sovereign Bonds [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 13.10%
Western Asset SMASh Series Core Plus Completion Fund | Asset-Backed Securities [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 8.40%
Western Asset SMASh Series Core Plus Completion Fund | Communication Services [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 4.30%
Western Asset SMASh Series Core Plus Completion Fund | Consumer Discretionary [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 4.20%
Western Asset SMASh Series Core Plus Completion Fund | Energy [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 3.60%
Western Asset SMASh Series Core Plus Completion Fund | Financials [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 3.30%
Western Asset SMASh Series Core Plus Completion Fund | Materials [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 3.30%
Western Asset SMASh Series Core Plus Completion Fund | Industrials [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 2.20%
Western Asset SMASh Series Core Plus Completion Fund | Health Care [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 1.90%
Western Asset SMASh Series Core Plus Completion Fund | Utilities [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 1.80%
Western Asset SMASh Series Core Plus Completion Fund | Information Technology [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 1.80%
Western Asset SMASh Series Core Plus Completion Fund | Consumer Staples [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 0.70%
Western Asset SMASh Series Core Plus Completion Fund | Real Estate [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 0.70%
Western Asset SMASh Series Core Plus Completion Fund | U.S. Government & Agency Obligations [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 0.70%
Western Asset SMASh Series Core Plus Completion Fund | Purchased Options  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 0.30%
Western Asset SMASh Series Core Plus Completion Fund | Non-U.S. Treasury Inflation Protected Securities [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Total Investments oef_PctOfTotalInv 0.00%