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Dividends (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | May 04, 2015 | Sep. 30, 2013
Dividends Payable [Line Items] |  |  |  |  |  |
Cash dividends per share (in dollars per share) | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.28 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Number of shares authorized |  |  |  |  |  | 10,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Shares repurchased |  |  | 3,900,000 us-gaap_TreasuryStockSharesAcquired |  |  |
Percent of outstanding shares acquired |  |  | 4.00%wfsl_TreasuryStockPercentofOutstandingSharesAcquired |  |  |
Average cost per share |  |  | $ 21.44 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Remaining authorized repurchase amount |  |  | $ 1.1 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  |  |  | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Number of shares authorized |  |  |  |  | 5,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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