    <SEC-DOCUMENT>0000936528-20-000027-index.html : 20200723
    <SEC-HEADER>0000936528-20-000027.hdr.sgml : 20200723
    <ACCEPTANCE-DATETIME>20200723141141
    ACCESSION NUMBER:		0000936528-20-000027
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		27
    CONFORMED PERIOD OF REPORT:	20200722
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200723
    DATE AS OF CHANGE:		20200723

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			WASHINGTON FEDERAL INC
    		CENTRAL INDEX KEY:			0000936528
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				911661606
    		STATE OF INCORPORATION:			WA
    		FISCAL YEAR END:			0930

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-34654
    		FILM NUMBER:		201043425

    	BUSINESS ADDRESS:
    		STREET 1:		425 PIKE STREET
    		CITY:			SEATTLE
    		STATE:			WA
    		ZIP:			98101
    		BUSINESS PHONE:		2066247930

    	MAIL ADDRESS:
    		STREET 1:		425 PIKE ST
    		CITY:			SEATTLE
    		STATE:			WA
    		ZIP:			98101
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>wfsl-20200722.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: wfsl-20200722.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>exhibit991june2020earn.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: exhibit991june2020earn.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>exhibit992june2020fact.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: exhibit992june2020fact.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>4
    <FILENAME>earningsreleasesupplemen.htm
    <DESCRIPTION>EX-99.3
    <TEXT>
    Document 4 - file: earningsreleasesupplemen.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>5
    <FILENAME>wfsl-20200722.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 5 - file: wfsl-20200722.xsd

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    <DOCUMENT>
    <TYPE>EX-101.CAL
    <SEQUENCE>6
    <FILENAME>wfsl-20200722_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: wfsl-20200722_cal.xml

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    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>7
    <FILENAME>wfsl-20200722_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: wfsl-20200722_def.xml

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    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>8
    <FILENAME>wfsl-20200722_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
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    <TYPE>EX-101.PRE
    <SEQUENCE>9
    <FILENAME>wfsl-20200722_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 9 - file: wfsl-20200722_pre.xml

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>earningsreleasesupplemen001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: earningsreleasesupplemen001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>earningsreleasesupplemen002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: earningsreleasesupplemen002.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>earningsreleasesupplemen003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: earningsreleasesupplemen003.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>earningsreleasesupplemen004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: earningsreleasesupplemen004.jpg

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    <SEQUENCE>14
    <FILENAME>earningsreleasesupplemen005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: earningsreleasesupplemen005.jpg

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    <DOCUMENT>
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    <SEQUENCE>15
    <FILENAME>earningsreleasesupplemen006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: earningsreleasesupplemen006.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>earningsreleasesupplemen007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: earningsreleasesupplemen007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>earningsreleasesupplemen008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: earningsreleasesupplemen008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>earningsreleasesupplemen009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: earningsreleasesupplemen009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>image11.jpg
    <TEXT>
    Document 19 - file: image11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>wfsl-20200722_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: wfsl-20200722_htm.html

    Document 20 - RAW XML: wfsl-20200722_htm.xml

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>21
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>22
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: Show.js

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>25
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 25 - file: FilingSummary.html

    Document 25 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>27
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>28
    <FILENAME>0000936528-20-000027-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: 0000936528-20-000027-xbrl.zip

    </DOCUMENT>
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