John Hancock Mid Cap Growth Fund Average Annual Total Returns - Class NAV [Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 23.81% | 13.86% | 12.55% |
| Russell Midcap Growth Index (reflects no deduction for fees, expenses, or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.10% | 11.47% | 11.54% |
| Class NAV | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 25.30% | 10.68% | 11.45% |
| Class NAV | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 25.30% | 6.89% | 8.03% |
| Class NAV | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 14.98% | 7.59% | 8.30% |