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Shareholder Report
 6 Months Ended
Feb. 28, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Putnam Global Health Care Fund
Entity Central Index Key 0000357295
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Class A  
Shareholder Report [Line Items]  
Fund Name Putnam Global Health Care Fund
Class Name Class A
Trading Symbol PHSTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Global Health Care Fund for the period September 1, 2025, to February 28, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class A
$55
1.01%
[1]
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.01%
Net Assets $ 1,588,887,619
Holdings Count | $ / shares 42
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2026)
Total Net Assets
$1,588,887,619
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
42
Portfolio Turnover Rate
43%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of February 28, 2026)
Portfolio Composition* (% of Total Investments)
image
 [2]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Putnam Global Health Care Fund
Class Name Class C
Trading Symbol PCHSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Global Health Care Fund for the period September 1, 2025, to February 28, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class C
$95
1.76%
[3]
Expenses Paid, Amount $ 95
Expense Ratio, Percent 1.76%
Net Assets $ 1,588,887,619
Holdings Count | $ / shares 42
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2026)
Total Net Assets
$1,588,887,619
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
42
Portfolio Turnover Rate
43%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of February 28, 2026)
Portfolio Composition* (% of Total Investments)
image
 [4]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Putnam Global Health Care Fund
Class Name Class R
Trading Symbol PHSRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Global Health Care Fund for the period September 1, 2025, to February 28, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class R
$68
1.26%
[5]
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.26%
Net Assets $ 1,588,887,619
Holdings Count | $ / shares 42
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2026)
Total Net Assets
$1,588,887,619
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
42
Portfolio Turnover Rate
43%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of February 28, 2026)
Portfolio Composition* (% of Total Investments)
image
 [6]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R6  
Shareholder Report [Line Items]  
Fund Name Putnam Global Health Care Fund
Class Name Class R6
Trading Symbol PGHAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Global Health Care Fund for the period September 1, 2025, to February 28, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class R6
$37
0.68%
[7]
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.68%
Net Assets $ 1,588,887,619
Holdings Count | $ / shares 42
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2026)
Total Net Assets
$1,588,887,619
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
42
Portfolio Turnover Rate
43%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of February 28, 2026)
Portfolio Composition* (% of Total Investments)
image
 [8]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class Y  
Shareholder Report [Line Items]  
Fund Name Putnam Global Health Care Fund
Class Name Class Y
Trading Symbol PHSYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Global Health Care Fund for the period September 1, 2025, to February 28, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment†
Class Y
$41
0.76%
[9]
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.76%
Net Assets $ 1,588,887,619
Holdings Count | $ / shares 42
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of February 28, 2026)
Total Net Assets
$1,588,887,619
Total Number of Portfolio Holdings (excludes derivatives, except purchased options, if any)
42
Portfolio Turnover Rate
43%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of February 28, 2026)
Portfolio Composition* (% of Total Investments)
image
 [10]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
† Annualized.
[2]
* Does not include derivatives, except purchased options, if any.  
[3]
† Annualized.
[4]
* Does not include derivatives, except purchased options, if any.  
[5]
† Annualized.
[6]
* Does not include derivatives, except purchased options, if any.  
[7]
† Annualized.
[8]
* Does not include derivatives, except purchased options, if any.  
[9]
† Annualized.
[10]
* Does not include derivatives, except purchased options, if any.