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Financial Information - Washington Federal, INC. - Statements of Operations and Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Expense |  |  |
Income before income taxes | $ 234,616 | $ 215,911 | $ 173,659
Income tax benefit | (83,111) | (77,728) | (62,518)
NET INCOME | 151,505 | 138,183 | 111,141
Cash Flows From Operating Activities |  |  |
NET INCOME | 151,505 | 138,183 | 111,141
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Decrease (increase) in other assets | 36,350 | (74,889) | 21,600
Net cash provided by operating activities | 181,422 | 174,956 | 261,697
Cash Flows From Financing Activities |  |  |
Proceeds from exercise of common stock options and related tax benefit | 4,261 | 357 | 1,686
Treasury stock purchased | (110,238) | (41,914) | (59,680)
Dividends paid on common stock | (37,835) | (32,430) | (25,697)
Net cash used by financing activities | (337,395) | (1,293,868) | (170,284)
Increase (decrease) in cash | (547,867) | (64,572) | (72,620)
Cash and cash equivalents at beginning of period | 751,430 | 816,002 | 888,622
Cash and cash equivalents at end of period | 203,563 | 751,430 | 816,002
Parent Company [Member] |  |  |
Income |  |  |
Dividends from subsidiary | 143,799 | 106,234 | 100,600
Total Income | 143,799 | 106,234 | 100,600
Expense |  |  |
Miscellaneous | 530 | 564 | 626
Total expense | 530 | 564 | 626
Income before income taxes | 143,269 | 105,670 | 99,974
Equity in undistributed net income of subsidiary | 8,045 | 32,513 | 11,167
Income before income taxes | 151,314 | 138,183 | 111,141
Income tax benefit | 191 | 0 | 0
NET INCOME | 151,505 | 138,183 | 111,141
Cash Flows From Operating Activities |  |  |
NET INCOME | 151,505 | 138,183 | 111,141
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in undistributed net income of subsidiaries | (4,893) | (32,513) | (4,382)
Decrease (increase) in other assets | 1 | 36 | (37)
Increase in other liabilities | 1,698 | 2,508 | 1,121
Net cash provided by operating activities | 148,311 | 108,214 | 107,843
Cash Flows From Financing Activities |  |  |
Proceeds from exercise of common stock options and related tax benefit | 4,261 | 357 | 1,686
Treasury stock purchased | (110,238) | (41,914) | (59,680)
Dividends paid on common stock | (37,835) | (32,430) | (26,796)
Net cash used by financing activities | (143,812) | (73,987) | (84,790)
Increase (decrease) in cash | 4,499 | 34,227 | 23,053
Cash and cash equivalents at beginning of period | 61,926 | 27,699 | 4,646
Cash and cash equivalents at end of period | $ 66,425 | $ 61,926 | $ 27,699

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