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SHAREHOLDERS' EQUITY - AOCI Changes (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2019 | Oct. 01, 2018 | Jun. 30, 2019 | Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 4,318,620 | $ 4,382,735 | $ 4,318,620 | $ 4,382,735
Adoption of ASU No. 2018-02 |  |  | 0 | 0
Balance at end of period |  |  | 4,095,054 | 4,095,054
ASU 2018-02 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2018-02 |  |  | (4,200) |
Unrealized Appreciation on Equity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  | 29,071 |  | 29,071
Adjusted balance after impact of new accounting pronouncements | 0 |  |  |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 0
Net current-period other comprehensive loss |  |  |  | 0
Balance at end of period |  |  | 0 | 0
Unrealized Appreciation on Equity Securities | ASU 2018-02 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2018-02 | 0 |  |  |
Unrealized Appreciation on Equity Securities | ASU 2016-01 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2016-01 |  | (29,071) |  |
Defined Benefit Pension Plan |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (12,072) | (12,521) | (12,072) | (12,521)
Adjusted balance | (16,311) |  |  |
Adjusted balance after impact of new accounting pronouncements | (16,760) |  |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 226 | 675
Net current-period other comprehensive loss |  |  | 226 | 675
Balance at end of period |  |  | (16,085) | (16,085)
Defined Benefit Pension Plan | ASU 2018-02 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2018-02 | (4,239) |  |  |
Defined Benefit Pension Plan | ASU 2016-01 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2016-01 |  | 0 |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (12,072) | 16,550 | (12,072) | 16,550
Adoption of ASU No. 2018-02 |  |  | (4,239) | (4,239)
Adjusted balance after impact of new accounting pronouncements | (16,760) |  |  |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 675
Net current-period other comprehensive loss |  |  |  | 675
Balance at end of period |  |  | $ (16,085) | $ (16,085)
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2018-02 | $ (4,239) |  |  |
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01 |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Adoption of ASU No. 2016-01 |  | $ (29,071) |  |

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