Prospectus 2 [Member] Expense Example - Prospectus 2 - PUTNAM MORTGAGE OPPORTUNITIES FUND - CLASS I	May 31, 2026 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 48
Expense Example, with Redemption, 3 Years	187
Expense Example, with Redemption, 5 Years	339
Expense Example, with Redemption, 10 Years	$ 781

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