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Financial Information - Washington Federal, Inc. - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 51,515 | $ 51,394 | $ 49,271 | $ 51,670 | $ 46,104 | $ 44,112 | $ 42,070 | $ 41,246 | $ 203,850 | $ 173,532 | $ 164,049
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  |  | 4,771 | 5,909 | 3,569
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | (6,876) | 7,974 | (14,204)
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  | 190,702 | 179,700 | 221,721
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  |  |  |  |  |  |  |  | 1,338 | 7,238 | 9,283
Warrants purchased |  |  |  |  |  |  |  |  | 0 | 0 | (7,744)
Treasury stock purchased |  |  |  |  |  |  |  |  | (164,249) | (98,374) | (87,850)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (55,997) | (74,519) | (49,926)
Net cash provided (used) by financing activities |  |  |  |  |  |  |  |  | 439,323 | 227,538 | 75,662
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (44,420) | (137,298) | 166,319
Cash and cash equivalents at beginning of year |  |  |  | 313,070 |  |  |  | 450,368 | 313,070 | 450,368 | 284,049
Cash and cash equivalents at end of year | 268,650 |  |  |  | 313,070 |  |  |  | 268,650 | 313,070 | 450,368
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 203,850 | 173,532 | 164,049
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (5,880) | (2,326) | (16,336)
Stock compensation expense |  |  |  |  |  |  |  |  | 4,771 | 5,910 | 3,659
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | 0 | 15 | (15)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 3,424 | (2,699) | 1,552
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  | 206,165 | 174,432 | 152,909
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  |  |  |  |  |  |  |  | 1,338 | 7,238 | 9,283
Warrants purchased |  |  |  |  |  |  |  |  | 0 | 0 | (7,744)
Treasury stock purchased |  |  |  |  |  |  |  |  | (164,249) | (98,374) | (87,850)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (55,997) | (74,519) | (49,926)
Net cash provided (used) by financing activities |  |  |  |  |  |  |  |  | (218,908) | (165,655) | (136,237)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (12,743) | 8,777 | 16,672
Cash and cash equivalents at beginning of year |  |  |  | $ 33,077 |  |  |  | $ 24,300 | 33,077 | 24,300 | 7,628
Cash and cash equivalents at end of year | $ 20,334 |  |  |  | $ 33,077 |  |  |  | $ 20,334 | $ 33,077 | $ 24,300

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