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SHAREHOLDERS' EQUITY - AOCI Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Pre-tax amounts: |  |  |
Accumulated other comprehensive income (loss) before tax | $ (1,061) | $ (3,123) | $ 134,433
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |
Balance | 4,895,846 | 4,891,169 | 4,446,075
Balance | 4,560,925 | 4,895,846 | 4,891,169
Accumulated other comprehensive income (loss) |  |  |
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |
Balance | (1,377) | 83,126 | 132,530
Other comprehensive income before reclassifications | 2,772 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (1,599) | (4,286) |
Net current-period other comprehensive Income (loss) | 1,173 |  |
Balance | (204) | (1,377) | 83,126
Unrealized appreciation (depreciation) on securities |  |  |
Pre-tax amounts: |  |  |
Accumulated other comprehensive income (loss) before tax | 33,051 | 27,021 | 157,838
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |
Balance | 17,201 | 97,418 |
Other comprehensive income before reclassifications | 2,772 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 926 |  |
Net current-period other comprehensive Income (loss) | 3,698 |  |
Balance | 20,899 | 17,201 | 97,418
Defined benefit pension plan |  |  |
Pre-tax amounts: |  |  |
Accumulated other comprehensive income (loss) before tax | (34,112) | (30,144) | (23,405)
Rollforward of accumulated other comprehensive income (loss), net of tax |  |  |
Balance | (18,578) | (14,292) |
Amounts reclassified from accumulated other comprehensive income (loss) | (2,525) | (4,286) |
Net current-period other comprehensive Income (loss) | (2,525) |  |
Balance | $ (21,103) | $ (18,578) | $ (14,292)

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