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SHAREHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	$ 4,012,223	$ 4,382,735	$ 4,164,591
Other comprehensive income (loss)	2,447	(11,875)	14,250
Balance	3,318,514	4,012,223	$ 4,382,735
Defined Benefit Pension Plan
Rollforward of accumulated other comprehensive income (loss), net of tax
Balance	(28,635)
Amounts reclassified from accumulated other comprehensive loss	2,447
Other comprehensive income (loss)	2,447
Balance	$ (26,188)	$ (28,635)

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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