Investor A C And Institutional [Member] Expense Example - Investor A C and Institutional - BlackRock California Municipal Opportunities Fund |
May 31, 2026
USD ($)
|
|---|---|
| Institutional | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 46 |
| Expense Example, with Redemption, 3 Years | 162 |
| Expense Example, with Redemption, 5 Years | 288 |
| Expense Example, with Redemption, 10 Years | 657 |
| Investor A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 493 |
| Expense Example, with Redemption, 3 Years | 650 |
| Expense Example, with Redemption, 5 Years | 819 |
| Expense Example, with Redemption, 10 Years | 1,311 |
| Investor C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 248 |
| Expense Example, with Redemption, 3 Years | 471 |
| Expense Example, with Redemption, 5 Years | 818 |
| Expense Example, with Redemption, 10 Years | $ 1,591 |