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Financial Information - WAFD, Inc.. - Statements of Cash Flows (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 08, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Cash Flows From Operating Activities |  |  |  |
Net income |  | $ 200,041 | $ 257,426 | $ 236,330
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Stock-based compensation expense |  | 9,181 | 7,914 | 6,808
Net cash provided by (used in) operating activities |  | 439,233 | 213,957 | 268,465
Cash Flows From Investing Activities |  |  |  |
Net cash provided by (used in) investing activities |  | 3,287,218 | (1,377,917) | (2,493,164)
Cash Flows From Financing Activities |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  | 5,187 | 1,089 | 1,823
Proceeds from issuance of preferred stock, net | $ 293,325 |  |  |
Proceeds from the purchase of common stock through the Employee Stock Purchase Program |  | 992 | 177 | 0
Repayment of long term senior debt |  | (95,000) | 0 | 0
Treasury stock purchased |  | (27,069) | (30,463) | (3,260)
Dividends paid on preferred stock |  | (14,625) | (14,625) | (14,625)
Dividends on common stock |  | (74,267) | (63,792) | (61,576)
Net cash provided by (used by) financing activities |  | (2,325,998) | 1,460,644 | 817,855
Increase (decrease) in cash and cash equivalents |  | 1,400,453 | 296,684 | (1,406,844)
Cash at beginning of year |  | 980,649 |  |
Cash at end of year |  | 2,381,102 | 980,649 |
Parent Company |  |  |  |
Cash Flows From Operating Activities |  |  |  |
Net income |  | 200,041 | 257,426 | 236,330
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Undistributed earnings from investments in subsidiaries |  | (68,628) | (202,643) | (63,956)
Distributions in excess of earnings from investments in subsidiaries |  | 0 | 0 | 0
Stock-based compensation expense |  | 9,181 | 7,914 | 6,808
Net changes in other assets and liabilities |  | 2,531 | 1,365 | 262
Net cash provided by (used in) operating activities |  | 143,125 | 64,062 | 179,444
Cash Flows From Investing Activities |  |  |  |
Net cash received in business combinations |  | 16,173 | 0 | 0
Equity method investments purchased |  | (3,000) | (12,500) | 0
Net cash provided by (used in) investing activities |  | 13,173 | (12,500) | 0
Cash Flows From Financing Activities |  |  |  |
Proceeds from exercise of common stock options and related tax benefit |  | 5,187 | 1,089 | 1,823
Proceeds from issuance of preferred stock, net |  | 0 | 0 | 0
Proceeds from the purchase of common stock through the Employee Stock Purchase Program |  | 992 | 177 | 0
Repayment of long term senior debt |  | (95,000) | 0 | 0
Treasury stock purchased |  | (27,069) | (30,463) | (3,260)
Dividends paid on preferred stock |  | (14,625) | (14,625) | (14,625)
Dividends on common stock |  | (74,267) | (63,792) | (61,576)
Net cash provided by (used by) financing activities |  | (204,782) | (107,614) | (77,638)
Increase (decrease) in cash and cash equivalents |  | (48,484) | (56,052) | 101,806
Cash at beginning of year |  | 74,450 | 130,502 | 28,696
Cash at end of year |  | $ 25,966 | $ 74,450 | $ 130,502

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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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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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