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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Increase in fair value	$ 12.0
Senior Notes | Senior Notes – 4.000%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.00%	4.00%		4.00%
Senior Notes | Senior Notes – 4.375%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.375%	4.375%	4.375%
Senior Notes | Senior Notes - 4.500%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.50%	4.50%			4.50%
Senior Notes | Senior Notes – 5.250%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	5.25%	5.25%				5.25%
Convertible debt investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost basis of investment		$ 193.1
Unrealized loss on investment		3.1
Investment income		0.3
Amortized cost of investment		$ 193.4

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of increase (decrease) in fair value adjustment on other assets (liabilities) carried at fair value under the fair value option on the statement of cash flows of Federal Home Loan Banks (FHLBanks).

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Cost of the investment.

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