John Hancock Mid Cap Growth Fund Investment Strategy - Class NAV [Member] - John Hancock Mid Cap Growth Fund	Mar. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of medium-sized companies with significant capital appreciation potential. For the fund, “medium-sized companies” are those with market capitalizations, at the time of purchase, within the collective market capitalization range of companies represented in either the Russell Mid Cap Index ($264.340 million to $201.349 billion as of March 31, 2025) or the S&P Mid Cap 400 Index ($1.180 billion to $18.497 billion as of March 31, 2025).The manager’s investment approach is based primarily on proprietary fundamental analysis. Fundamental analysis involves the assessment of a company through such factors as its business environment, management, balance sheet, income statement, anticipated earnings, revenues and other related measures of value. In analyzing companies for investment, the manager looks for, among other things, a strong balance sheet, strong earnings growth, attractive industry dynamics, strong competitive advantages (e.g., strong management teams), and attractive relative value within the context of a security’s primary trading market. Securities are sold when the investment has achieved its intended purpose, or because it is no longer considered attractive.The fund may invest up to 25% of its total assets in foreign securities, including emerging market securities. The fund may also invest in American Depositary Receipts (ADRs). The manager will consider, but is not limited to, the MSCI market classifications in determining whether a country is a developed or emerging market country.

John Hancock Mid Cap Growth Fund Investment Strategy - Class NAV [Member] - John Hancock Mid Cap Growth Fund

Mar. 31, 2025

<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>

Strategy Narrative [Text Block]

Under normal market conditions, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of medium-sized companies with significant capital appreciation potential. For the fund, “medium-sized companies” are those with market capitalizations, at the time of purchase, within the collective market capitalization range of companies represented in either the Russell Mid Cap Index ($264.340 million to $201.349 billion as of March 31, 2025) or the S&P Mid Cap 400 Index ($1.180 billion to $18.497 billion as of March 31, 2025).The manager’s investment approach is based primarily on proprietary fundamental analysis. Fundamental analysis involves the assessment of a company through such factors as its business environment, management, balance sheet, income statement, anticipated earnings, revenues and other related measures of value. In analyzing companies for investment, the manager looks for, among other things, a strong balance sheet, strong earnings growth, attractive industry dynamics, strong competitive advantages (e.g., strong management teams), and attractive relative value within the context of a security’s primary trading market. Securities are sold when the investment has achieved its intended purpose, or because it is no longer considered attractive.The fund may invest up to 25% of its total assets in foreign securities, including emerging market securities. The fund may also invest in American Depositary Receipts (ADRs). The manager will consider, but is not limited to, the MSCI market classifications in determining whether a country is a developed or emerging market country.