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Financial Information - Washington Federal, INC. - Statement of Financial Condition (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Other assets | $ 185,826 | $ 199,271 |  |
Total assets | 15,253,580 | 14,888,063 |  |
Liabilities |  |  |  |
Total liabilities | 13,247,892 | 12,912,332 |  |
Stockholders’ equity |  |  |  |
Total stockholders’ equity | 2,005,688 | 1,975,731 | $ 1,955,679 | $ 1,973,283
Total liabilities and stockholders’ equity | 15,253,580 | 14,888,063 |  |
Parent Company |  |  |  |
Assets |  |  |  |
Cash | 33,077 | 24,300 |  |
Other assets | 0 | 15 |  |
Investment in subsidiary | 1,972,675 | 1,954,179 |  |
Total assets | 2,005,752 | 1,978,494 |  |
Liabilities |  |  |  |
Other liabilities | 64 | 2,763 |  |
Total liabilities | 64 | 2,763 |  |
Stockholders’ equity |  |  |  |
Total stockholders’ equity | 2,005,688 | 1,975,731 |  |
Total liabilities and stockholders’ equity | $ 2,005,752 | $ 1,978,494 |  |

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