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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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Stockholders' Equity Attributable To Parent, Adjusted Balance

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for unrealized gain (loss) from increase (decrease) in instrument-specific credit risk, realized upon derecognition of financial liability measured under fair value option.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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