v3.26.1
Revenue from Contracts with Customers (Details)
6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]
Revenue streams percentage, contract with customer
4.00%
3.40%
X
- References
No definition available.
+ Details
Name:
us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:
us-gaap_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Revenue From Contract With Customer, Percentage
+ References
No definition available.
+ Details
Name:
wfsl_RevenueFromContractWithCustomerPercentage
Namespace Prefix:
wfsl_
Data Type:
dtr-types:percentItemType
Balance Type:
na
Period Type:
duration