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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						9 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,083,696	$ 3,224,918	$ 3,318,514	$ 3,461,006	$ 3,975,537	$ 4,012,223	$ 3,318,514	$ 4,012,223
Other comprehensive income	460	457	457	521	516	516	1,374	1,553
Ending balance	3,007,907	3,083,696	3,224,918	$ 3,396,057	$ 3,461,006	$ 3,975,537	3,007,907	$ 3,396,057
Defined Benefit Pension Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(25,274)		$ (26,188)				(26,188)
Amounts reclassified from accumulated other comprehensive loss	460						1,374
Other comprehensive income	460						1,374
Ending balance	$ (24,814)	$ (25,274)					$ (24,814)

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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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