Investor A C and Institutional [Member] Expense Example - Investor A, C and Institutional - BlackRock California Municipal Opportunities Fund |
May 31, 2025
USD ($)
|
|---|---|
| Institutional Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 48 |
| Expense Example, with Redemption, 3 Years | 155 |
| Expense Example, with Redemption, 5 Years | 272 |
| Expense Example, with Redemption, 10 Years | 614 |
| Investor A Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 494 |
| Expense Example, with Redemption, 3 Years | 642 |
| Expense Example, with Redemption, 5 Years | 803 |
| Expense Example, with Redemption, 10 Years | 1,270 |
| Investor C Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 250 |
| Expense Example, with Redemption, 3 Years | 467 |
| Expense Example, with Redemption, 5 Years | 807 |
| Expense Example, with Redemption, 10 Years | $ 1,559 |