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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
INTEREST INCOME
Loans	$ 108,293us-gaap_InterestAndFeeIncomeLoansAndLeases	$ 107,227us-gaap_InterestAndFeeIncomeLoansAndLeases
Mortgage-backed securities	19,175us-gaap_InterestIncomeSecuritiesMortgageBacked	19,368us-gaap_InterestIncomeSecuritiesMortgageBacked
Investment securities and cash equivalents	5,816wfsl_InvestmentIncomeAndOther	4,663wfsl_InvestmentIncomeAndOther
Interest income	133,284us-gaap_InvestmentIncomeInterestAndDividend	131,258us-gaap_InvestmentIncomeInterestAndDividend
INTEREST EXPENSE
Customer accounts	13,445us-gaap_InterestExpenseDeposits	15,499us-gaap_InterestExpenseDeposits
FHLB advances and other borrowings	17,656us-gaap_InterestExpenseBorrowings	17,447us-gaap_InterestExpenseBorrowings
Interest expense	31,101us-gaap_InterestExpense	32,946us-gaap_InterestExpense
Net interest income	102,183us-gaap_InterestIncomeExpenseNet	98,312us-gaap_InterestIncomeExpenseNet
Reversal of provision for loan losses	(5,500)us-gaap_ProvisionForLoanAndLeaseLosses	(4,600)us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after reversal of provision for loan losses	107,683us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	102,912us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
OTHER INCOME
Loan fee income	2,065us-gaap_FeesAndCommissionsMortgageBanking	2,046us-gaap_FeesAndCommissionsMortgageBanking
Deposit fee income	5,977us-gaap_FeesAndCommissionsDepositorAccounts	1,704us-gaap_FeesAndCommissionsDepositorAccounts
Other income (loss)	(2,662)us-gaap_NoninterestIncomeOtherOperatingIncome	2,038us-gaap_NoninterestIncomeOtherOperatingIncome
Noninterest income	5,380us-gaap_NoninterestIncome	5,788us-gaap_NoninterestIncome
OTHER EXPENSE
Compensation and benefits	29,160us-gaap_LaborAndRelatedExpense	25,126us-gaap_LaborAndRelatedExpense
Occupancy	8,135us-gaap_OccupancyNet	7,050us-gaap_OccupancyNet
FDIC insurance premiums	674us-gaap_FederalDepositInsuranceCorporationPremiumExpense	2,934us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Information technology	4,030us-gaap_InformationTechnologyAndDataProcessing	1,318us-gaap_InformationTechnologyAndDataProcessing
Product delivery	5,627us-gaap_AmortizationOfIntangibleAssets	2,929us-gaap_AmortizationOfIntangibleAssets
Other expense	5,974us-gaap_OtherNoninterestExpense	4,763us-gaap_OtherNoninterestExpense
Noninterest expense	53,600us-gaap_NoninterestExpense	44,120us-gaap_NoninterestExpense
Gain (loss) on real estate acquired through foreclosure, net	315us-gaap_GainsLossesOnSalesOfOtherRealEstate	(1,951)us-gaap_GainsLossesOnSalesOfOtherRealEstate
Income before income taxes	59,778us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	62,629us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision	21,371us-gaap_IncomeTaxExpenseBenefit	22,393us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 38,407us-gaap_NetIncomeLoss	$ 40,236us-gaap_NetIncomeLoss
PER SHARE DATA
Basic earnings (in dollars per share)	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic
Diluted earnings (in dollars per share)	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted
Cash dividends per share (in dollars per share)	$ 0.15us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.10us-gaap_CommonStockDividendsPerShareCashPaid
Basic weighted average number of shares outstanding (in shares)	98,147,939us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	102,329,578us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average number of shares outstanding, including dilutive stock options (in shares)	98,524,839us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	102,813,154us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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