v3.26.1
Revenue from Contracts with Customers (Details)
9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]
Revenue streams percentage, contract with customer
4.10%
3.60%
X
- References
No definition available.
+ Details
Name:
us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:
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Data Type:
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Period Type:
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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