Shareholder Report, Average Annual Return (Details) 74200166800_Putnam Mortgage Opportunities Fund_Class I_TSR Annual {Class I} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
May 31, 2026 |
May 31, 2026 |
May 31, 2026 |
|
| Class I | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| Average Annual Return, Percent | 7.60% | 6.49% | 5.26% |
| Bloomberg U.S. Aggregate Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | ||
| Average Annual Return, Percent | 5.13% | 0.17% | 1.70% |
| ICE BofA U.S. Treasury Bill Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | ICE BofA U.S. Treasury Bill Index | ||
| Average Annual Return, Percent | 4.00% | 3.48% | 2.34% |
| Bloomberg U.S. MBS Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. MBS Index | ||
| Average Annual Return, Percent | 6.85% | 0.45% | 1.44% |