Shareholder Report, Holdings (Details)	Aug. 31, 2025
C000194849 \| California
Holdings [Line Items]
Percent of Net Asset Value	95.50%
C000194849 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000194849 \| Other Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000194849 \| Air & Sea Transportation
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000194849 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000194849 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.90%
C000194849 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.90%
C000194849 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	9.50%
C000194849 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000194849 \| Lease Revenue
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000194849 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000194849 \| Water & Sewer Revenue
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000194849 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	22.90%
C000194850 \| California
Holdings [Line Items]
Percent of Net Asset Value	95.50%
C000194850 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000194850 \| Other Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000194850 \| Air & Sea Transportation
Holdings [Line Items]
Percent of Net Asset Value	18.70%
C000194850 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	12.50%
C000194850 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.90%
C000194850 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.90%
C000194850 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	9.50%
C000194850 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000194850 \| Lease Revenue
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000194850 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000194850 \| Water & Sewer Revenue
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000194850 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	22.90%