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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 34,343 | $ 34,852 | $ 36,377 | $ 67,866 | $ 52,362 | $ 53,854 | $ 51,098 | $ 52,942 | $ 173,438 | $ 210,256 | $ 203,850
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 6,469 | 5,265 | 4,771
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  | 166,600 | 234,054 | 190,702
Cash Flows From Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of strategic investments |  |  |  |  |  |  |  |  | 0 | (5,000) | 0
Net cash provided (used) by investing activities |  |  |  |  |  |  |  |  | (920,979) | (421,373) | (674,445)
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  |  |  |  |  |  |  |  | 144 | 298 | 1,338
Treasury stock purchased |  |  |  |  |  |  |  |  | (112,133) | (123,854) | (164,249)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (66,496) | (63,318) | (55,997)
Net cash provided (used) by financing activities |  |  |  |  |  |  |  |  | 2,038,198 | 337,827 | 439,323
Cash at beginning of year |  |  |  | 419,158 |  |  |  |  | 419,158 |  |
Cash at end of year | 1,702,977 |  |  |  | 419,158 |  |  |  | 1,702,977 | 419,158 |
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 173,438 | 210,256 | 203,850
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 17,055 | (2,213) | (5,880)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 6,469 | 5,265 | 4,771
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 0 | (3,489) | 3,424
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  | 196,962 | 209,819 | 206,165
Cash Flows From Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of strategic investments |  |  |  |  |  |  |  |  | 0 | (5,000) | 0
Net cash provided (used) by investing activities |  |  |  |  |  |  |  |  | 0 | (5,000) | 0
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  |  |  |  |  |  |  |  | 144 | 740 | 1,338
Treasury stock purchased |  |  |  |  |  |  |  |  | (112,133) | (123,854) | (164,249)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (66,496) | (63,318) | (55,997)
Net cash provided (used) by financing activities |  |  |  |  |  |  |  |  | (178,485) | (186,432) | (218,908)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 18,477 | 18,387 | (12,743)
Cash at beginning of year |  |  |  | $ 38,721 |  |  |  | $ 20,334 | 38,721 | 20,334 | 33,077
Cash at end of year | $ 57,198 |  |  |  | $ 38,721 |  |  |  | $ 57,198 | $ 38,721 | $ 20,334

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