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Document and Entity Information
Jul. 23, 2020
Jul. 22, 2020
Cover [Abstract]    
Document Type   8-K
Document Period End Date Jul. 22, 2020  
Entity Registrant Name   WASHINGTON FEDERAL INC
Entity Central Index Key   0000936528
Amendment Flag   false
Entity Incorporation, State or Country Code   WA
Entity File Number   001-34654
Entity Tax Identification Number   91-1661606
Entity Address, Address Line One   425 Pike Street
Entity Address, City or Town   Seattle
Entity Address, State or Province   WA
Entity Address, Postal Zip Code   98101
City Area Code   206
Local Phone Number   624-7930
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Entity Emerging Growth Company   false