XML 125 R87.htm IDEA: XBRL DOCUMENT v3.21.2

Income Taxes - Narrative (Details)	12 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Returns open to examination, minimum (years)	3 years
Returns open to examination, maximum (years)	5 years
Returns open to examination, state impact of federal changes, maximum (years)	2 years

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax Examination, Returns Open to Examination, Maximum

+ References

No definition available.

+ Details

Name:	wfsl_IncomeTaxExaminationReturnsOpentoExaminationMaximum
Namespace Prefix:	wfsl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax Examination, Returns Open to Examination, Minimum

+ References

No definition available.

+ Details

Name:	wfsl_IncomeTaxExaminationReturnsOpentoExaminationMinimum
Namespace Prefix:	wfsl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax Examination, Returns Open to Examination, State Impact of Federal Changes, Maximum

+ References

No definition available.

+ Details

Name:	wfsl_IncomeTaxExaminationReturnsOpentoExaminationStateImpactofFederalChangesMaximum
Namespace Prefix:	wfsl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration