Shareholder Report, Holdings (Details)	Aug. 31, 2026
C000194849 \| California
Holdings [Line Items]
Percent of Net Asset Value	97.10%
C000194849 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000194849 \| Investment TypeOther Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	(0.90%)
C000194849 \| Air & Sea Transportation
Holdings [Line Items]
Percent of Net Asset Value	20.70%
C000194849 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	15.10%
C000194849 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000194849 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000194849 \| Genl Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	10.70%
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	2.20%
C000194849 \| Industrial & Pollution Control Revenue
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000194849 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000194849 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	17.70%
C000194850 \| California
Holdings [Line Items]
Percent of Net Asset Value	97.10%
C000194850 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000194850 \| Investment TypeOther Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	(0.90%)
C000194850 \| Air & Sea Transportation
Holdings [Line Items]
Percent of Net Asset Value	20.70%
C000194850 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	15.10%
C000194850 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000194850 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000194850 \| Genl Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	10.70%
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	2.20%
C000194850 \| Industrial & Pollution Control Revenue
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000194850 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000194850 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	17.70%