John Hancock Global Climate Action Fund Shareholder Fees - Class A C R6 [Member] - John Hancock Global Climate Action Fund	Mar. 31, 2025 USD ($)
Class A
Prospectus [Line Items]
Maximum Cumulative Sales Charge (as a percentage of Offering Price)	5.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
Maximum Account Fee	$ 20
Class C
Prospectus [Line Items]
Maximum Cumulative Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	1.00%
Maximum Account Fee	$ 20
Class R6
Prospectus [Line Items]
Maximum Cumulative Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%
Maximum Account Fee	$ 0