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Financial Information - Washington Federal, INC. - Statements of Cash Flows (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Cash Flows From Operating Activities                        
Net income   $ 44,224,000 $ 43,004,000 $ 41,723,000 $ 35,098,000 $ 42,498,000 $ 39,050,000 $ 40,361,000 $ 38,407,000 $ 164,049,000 $ 160,316,000 $ 157,364,000
Adjustments to reconcile net income to net cash provided by operating activities:                        
Decrease (increase) in other assets                   (14,204,000) (29,220,000) (17,799,000)
Net cash provided (used) by operating activities                   221,721,000 142,871,000 173,715,000
Cash Flows From Financing Activities                        
Proceeds from exercise of common stock options and related tax benefit                   9,283,000 2,070,000 10,252,000
Repurchase of warrants $ (7,718,158)                 (7,744,000) 0 0
Treasury stock purchased                   (87,850,000) (126,728,000) (104,291,000)
Dividends paid on common stock                   (49,926,000) (51,111,000) (42,065,000)
Net cash provided (used) by financing activities                   75,662,000 (350,176,000) (376,457,000)
Increase (decrease) in cash and cash equivalents                   166,319,000 (497,794,000) 578,280,000
Cash and cash equivalents at beginning of year         284,049,000       781,843,000 284,049,000 781,843,000 203,563,000
Cash and cash equivalents at end of year 450,368,000 450,368,000       284,049,000       450,368,000 284,049,000 781,843,000
Parent Company                        
Cash Flows From Operating Activities                        
Net income                   164,049,000 160,316,000 157,364,000
Adjustments to reconcile net income to net cash provided by operating activities:                        
Equity in undistributed net income of subsidiaries                   (12,677,000) 32,375,000 (87,943,000)
Decrease (increase) in other assets                   (15,000) 0 1,000
Increase in other liabilities                   1,552,000 (13,189,000) 4,152,000
Net cash provided (used) by operating activities                   152,909,000 179,502,000 73,574,000
Cash Flows From Financing Activities                        
Proceeds from exercise of common stock options and related tax benefit                   9,283,000 2,070,000 10,252,000
Treasury stock purchased                   (87,850,000) (126,728,000) (104,291,000)
Dividends paid on common stock                   (49,926,000) (51,111,000) (42,065,000)
Net cash provided (used) by financing activities                   (136,237,000) (175,769,000) (136,104,000)
Increase (decrease) in cash and cash equivalents                   16,672,000 3,733,000 (62,530,000)
Cash and cash equivalents at beginning of year         $ 7,628,000       $ 3,895,000 7,628,000 3,895,000 66,425,000
Cash and cash equivalents at end of year $ 24,300,000 $ 24,300,000       $ 7,628,000       $ 24,300,000 $ 7,628,000 $ 3,895,000