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Schedule - Shareholder Fees {- Thornburg Investment Income Builder Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000243 - Schedule - Annual Fund Operating Expenses {- Thornburg Investment Income Builder Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000244 - Schedule - Expense Example {Transposed} {- Thornburg Investment Income Builder Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000245 - Schedule - Expense Example, No Redemption {Transposed} {- Thornburg Investment Income Builder Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000246 - Schedule - Annual Total Returns - Thornburg Investment Income Builder Fund Class R3 R4 R5 [BarChart] link:presentationLink link:calculationLink link:definitionLink 000247 - Schedule - Average Annual Total Returns {Transposed} {- Thornburg Investment Income Builder Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000248 - Document - Risk/Return Detail {Unlabeled} - Thornburg Investment Income Builder Fund Class R3 R4 R5 link:presentationLink link:calculationLink link:definitionLink 000249 - Disclosure - Risk/Return Detail Data {Elements} - Thornburg Investment Income Builder Fund Class R3 R4 R5 link:presentationLink link:calculationLink link:definitionLink 000251 - Document - Risk/Return Summary {Unlabeled} - Thornburg Global Opportunities Fund Class R3 R4 R5 link:presentationLink link:calculationLink link:definitionLink 000252 - Schedule - Shareholder Fees {- Thornburg Global Opportunities Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000253 - Schedule - Annual Fund Operating Expenses {- Thornburg Global Opportunities Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000254 - Schedule - Expense Example {Transposed} {- Thornburg Global Opportunities Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000255 - Schedule - Expense Example, No Redemption {Transposed} {- Thornburg Global Opportunities Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000256 - Schedule - Annual Total Returns - Thornburg Global Opportunities Fund Class R3 R4 R5 [BarChart] link:presentationLink link:calculationLink link:definitionLink 000257 - Schedule - Average Annual Total Returns {Transposed} {- Thornburg Global Opportunities Fund Class R3 R4 R5} link:presentationLink link:calculationLink link:definitionLink 000258 - Document - Risk/Return Detail {Unlabeled} - Thornburg Global Opportunities Fund Class R3 R4 R5 link:presentationLink link:calculationLink link:definitionLink 000259 - Disclosure - Risk/Return Detail Data {Elements} - Thornburg Global Opportunities Fund Class R3 R4 R5 link:presentationLink link:calculationLink link:definitionLink 000261 - Document - Risk/Return Summary {Unlabeled} - Thornburg Developing World Fund Class R5 R6 link:presentationLink link:calculationLink link:definitionLink 000262 - Schedule - Shareholder Fees {- Thornburg Developing World Fund Class R5 R6} link:presentationLink link:calculationLink link:definitionLink 000263 - Schedule - Annual Fund Operating Expenses {- Thornburg Developing World Fund Class R5 R6} link:presentationLink link:calculationLink link:definitionLink 000264 - Schedule - Expense Example {Transposed} {- Thornburg Developing World Fund Class R5 R6} link:presentationLink link:calculationLink link:definitionLink 000265 - Schedule - Expense Example, No Redemption {Transposed} {- Thornburg Developing World Fund Class R5 R6} link:presentationLink link:calculationLink link:definitionLink 000266 - Schedule - Annual Total Returns - Thornburg Developing World Fund Class R5 R6 [BarChart] link:presentationLink link:calculationLink link:definitionLink 000267 - Schedule - Average Annual Total Returns {Transposed} {- Thornburg Developing World Fund Class R5 R6} link:presentationLink link:calculationLink link:definitionLink 000268 - Document - Risk/Return Detail {Unlabeled} - Thornburg Developing World Fund Class R5 R6 link:presentationLink link:calculationLink link:definitionLink 000269 - Disclosure - Risk/Return Detail Data {Elements} - Thornburg Developing World Fund Class R5 R6 link:presentationLink link:calculationLink link:definitionLink