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Financial Information - Washington Federal, INC. - Statements of Cash Flows (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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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

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