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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 52,362 | $ 53,854 | $ 51,098 | $ 52,942 | $ 51,515 | $ 51,394 | $ 49,271 | $ 51,670 | $ 210,256 | $ 203,850 | $ 173,532
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  |  | 5,265 | 4,771 | 5,909
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | (17,416) | (6,876) | 7,974
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  | 234,054 | 190,702 | 179,700
Cash Flows From Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of strategic investments |  |  |  |  |  |  |  |  | (5,000) | 0 | 0
Net cash provided (used) by investing activities |  |  |  |  |  |  |  |  | (421,373) | (674,445) | (544,536)
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  |  |  |  |  |  |  |  | 298 | 1,338 | 7,238
Treasury stock purchased |  |  |  |  |  |  |  |  | (123,854) | (164,249) | (98,374)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (63,318) | (55,997) | (74,519)
Net cash provided (used) by financing activities |  |  |  |  |  |  |  |  | 337,827 | 439,323 | 227,538
Cash at beginning of year |  |  |  | 268,650 |  |  |  |  | 268,650 |  |
Cash at end of year | 419,158 |  |  |  | 268,650 |  |  |  | 419,158 | 268,650 |
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 210,256 | 203,850 | 173,532
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (2,213) | (5,880) | (2,326)
Stock compensation expense |  |  |  |  |  |  |  |  | 5,265 | 4,771 | 5,910
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | 0 | 0 | 15
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | (3,489) | 3,424 | (2,699)
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  | 209,819 | 206,165 | 174,432
Cash Flows From Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of strategic investments |  |  |  |  |  |  |  |  | (5,000) | 0 | 0
Net cash provided (used) by investing activities |  |  |  |  |  |  |  |  | (5,000) | 0 | 0
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  |  |  |  |  |  |  |  | 740 | 1,338 | 7,238
Treasury stock purchased |  |  |  |  |  |  |  |  | (123,854) | (164,249) | (98,374)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (63,318) | (55,997) | (74,519)
Net cash provided (used) by financing activities |  |  |  |  |  |  |  |  | (186,432) | (218,908) | (165,655)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 18,387 | (12,743) | 8,777
Cash at beginning of year |  |  |  | $ 20,334 |  |  |  | $ 33,077 | 20,334 | 33,077 | 24,300
Cash at end of year | $ 38,721 |  |  |  | $ 20,334 |  |  |  | $ 38,721 | $ 20,334 | $ 33,077

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