John Hancock Investment Grade Bond Fund Annual Fund Operating Expenses - John Hancock Investment Grade Bond Fund Classes A C I R2 R4 and R6 [Member] - John Hancock Investment Grade Bond Fund |
May 31, 2025 |
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| Prospectus [Line Items] | ||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | <span style="font-family:Arial Narrow;font-size:8pt;">July 31, 2027</span><span style="font-family:Arial Narrow;font-size:8pt;">September 30, 2026</span> | |||||||
| Class A | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.39% | |||||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||||
| Component1 Other Expenses | 0.00% | |||||||
| Component2 Other Expenses | 0.18% | |||||||
| Other Expenses (as a percentage of Assets): | 0.18% | |||||||
| Expenses (as a percentage of Assets) | 0.82% | |||||||
| Fee Waiver or Reimbursement | (0.08%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 0.74% | |||||||
| Class C | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.39% | |||||||
| Distribution and Service (12b-1) Fees | 1.00% | |||||||
| Component1 Other Expenses | 0.00% | |||||||
| Component2 Other Expenses | 0.18% | |||||||
| Other Expenses (as a percentage of Assets): | 0.18% | |||||||
| Expenses (as a percentage of Assets) | 1.57% | |||||||
| Fee Waiver or Reimbursement | (0.08%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 1.49% | |||||||
| Class I | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.39% | |||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||
| Component1 Other Expenses | 0.00% | |||||||
| Component2 Other Expenses | 0.18% | |||||||
| Other Expenses (as a percentage of Assets): | 0.18% | |||||||
| Expenses (as a percentage of Assets) | 0.57% | |||||||
| Fee Waiver or Reimbursement | (0.08%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 0.49% | |||||||
| Class R2 | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.39% | |||||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||||
| Component1 Other Expenses | 0.25% | [2] | ||||||
| Component2 Other Expenses | 0.07% | |||||||
| Other Expenses (as a percentage of Assets): | 0.32% | |||||||
| Expenses (as a percentage of Assets) | 0.96% | |||||||
| Fee Waiver or Reimbursement | (0.08%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 0.88% | |||||||
| Class R4 | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.39% | |||||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||||
| Component1 Other Expenses | 0.10% | |||||||
| Component2 Other Expenses | 0.07% | |||||||
| Other Expenses (as a percentage of Assets): | 0.17% | |||||||
| Expenses (as a percentage of Assets) | 0.81% | |||||||
| Fee Waiver or Reimbursement | (0.18%) | [1],[3] | ||||||
| Net Expenses (as a percentage of Assets) | 0.63% | |||||||
| Class R6 | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.39% | |||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||
| Component1 Other Expenses | 0.00% | |||||||
| Component2 Other Expenses | 0.07% | |||||||
| Other Expenses (as a percentage of Assets): | 0.07% | |||||||
| Expenses (as a percentage of Assets) | 0.46% | |||||||
| Fee Waiver or Reimbursement | (0.08%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 0.38% | |||||||
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