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Financial Information - WAFD, Inc.. - Statements of Cash Flows (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 08, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Cash Flows From Operating Activities |  |  |  |
Net income |  | $ 257,426 | $ 236,330 | $ 183,615
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Stock-based compensation expense |  | 7,914 | 6,808 | 6,381
Decrease (increase) in other assets |  | (67,342) | (100,146) | 155,599
Net cash provided (used) by operating activities |  | 213,957 | 268,465 | 314,454
Cash Flows From Investing Activities |  |  |  |
Purchase of strategic investments |  | (12,500) | 0 | 0
Net cash provided (used) by investing activities |  | (1,377,917) | (2,493,164) | (579,745)
Cash Flows From Financing Activities |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  | 1,089 | 1,823 | 339
Proceeds from issuance of preferred stock, net | $ 293,325 | 0 | 0 | 293,325
Proceeds from employee stock purchase |  | 177 | 0 | 0
Treasury stock purchased |  | (30,463) | (3,260) | (348,651)
Dividends paid on preferred stock |  | (14,625) | (14,625) | (6,378)
Dividends on common stock |  | (63,792) | (61,576) | (65,876)
Net cash provided (used) by financing activities |  | 1,460,644 | 817,855 | 653,123
Increase (decrease) in cash and cash equivalents |  | 296,684 | (1,406,844) | 387,832
Cash at beginning of year |  | 683,965 |  |
Cash at end of year |  | 980,649 | 683,965 |
Parent Company |  |  |  |
Cash Flows From Operating Activities |  |  |  |
Net income |  | 257,426 | 236,330 | 183,615
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Undistributed earnings from investments in subsidiaries |  | (202,643) | (63,956) | (91,697)
Distributions in excess of earnings from investments in subsidiaries |  | 0 | 0 | 0
Stock-based compensation expense |  | 7,914 | 6,808 | 6,381
Decrease (increase) in other assets |  | 1,329 | 0 | 0
Increase in other liabilities |  | 36 | 262 | 440
Net cash provided (used) by operating activities |  | 64,062 | 179,444 | 98,739
Cash Flows From Investing Activities |  |  |  |
Purchase of strategic investments |  | (12,500) | 0 | 0
Net cash provided (used) by investing activities |  | (12,500) | 0 | 0
Cash Flows From Financing Activities |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  | 1,089 | 1,823 | 339
Proceeds from issuance of preferred stock, net |  | 0 | 0 | 293,325
Proceeds from employee stock purchase |  | 177 | 0 | 0
Treasury stock purchased |  | (30,463) | (3,260) | (348,651)
Dividends paid on preferred stock |  | (14,625) | (14,625) | (6,378)
Dividends on common stock |  | (63,792) | (61,576) | (65,876)
Net cash provided (used) by financing activities |  | (107,614) | (77,638) | (127,241)
Increase (decrease) in cash and cash equivalents |  | (56,052) | 101,806 | (28,502)
Cash at beginning of year |  | 130,502 | 28,696 | 57,198
Cash at end of year |  | $ 74,450 | $ 130,502 | $ 28,696

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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