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SHAREHOLDERS' EQUITY - Summary of the Changes in Accumulated Other Comprehensive Loss, Net of Tax, by Component (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,224,918	$ 3,318,514	$ 3,975,537	$ 4,012,223	$ 3,318,514	$ 4,012,223
Other comprehensive income	457	457	516	516	914	1,032
Ending balance	3,083,696	3,224,918	$ 3,461,006	$ 3,975,537	3,083,696	$ 3,461,006
Defined Benefit Pension Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(25,731)	(26,188)			(26,188)
Amounts reclassified from accumulated other comprehensive loss	457				914
Other comprehensive income	457				914
Ending balance	$ (25,274)	$ (25,731)			$ (25,274)

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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