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Loans Receivable - FDIC Indemnification Asset (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2016
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	$ 12,769	$ 16,275
Payments made (received)	(264)	(1,730)
Amortization	(802)	(2,012)
Accretion	118	236
Balance at end of period	$ 11,821	$ 12,769

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- Definition

Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetAccretionOfDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

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- Definition

FDIC Indemnification Asset, Cash Payments Received (Made)

+ References

No definition available.

+ Details

Name:	wfsl_FDICIndemnificationAssetCashPaymentsReceivedMade
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

FDIC Indemnification Asset, Amortization

+ References

No definition available.

+ Details

Name:	wfsl_FdicIndemnificationAssetAmortization
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

The net present value of the amount expected to be received from the FDIC in connection with loss share agreements.

+ References

No definition available.

+ Details

Name:	wfsl_FdicLossShareReceivable
Namespace Prefix:	wfsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant