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DEBT - Senior Notes Narrative (Details)						1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) $ / shares	Jun. 17, 2024	May 23, 2024 USD ($) day	Mar. 03, 2021 USD ($)	Sep. 24, 2019 USD ($)	May 31, 2024 USD ($)	Jun. 29, 2025 $ / shares	Sep. 30, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Amount			$ 50,000,000			$ 50,000,000
Payments for premium on equity component of convertible debt								$ 0	$ 25,200,000	$ 0
Dividend per share (in dollars per share) | $ / shares							$ 0.47	$ 1.88	$ 1.68	$ 1.68
Convertible Debt
Debt Instrument [Line Items]
Redemption price percentage		100.667%
3.375% Exchangeable Notes, due June 1, 2029
Debt Instrument [Line Items]
Stated interest rate	3.375%		3.375%					3.375%	3.40%
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt
Debt Instrument [Line Items]
Aggregate borrowing amount			$ 350,000,000
Payments for premium on equity component of convertible debt			$ 25,200,000
Threshold percentage of stock price trigger			130.00%
Threshold trading days | day			20
Threshold consecutive trading days | day			30
Convertible, conversion price (in dollars per share) | $ / shares	$ 121.51							$ 121.51
Scheduled trading day | day			41
Redemption price percentage			100.00%
Unamortized debt issuance costs	$ 9,000,000.0		$ 11,800,000					$ 9,000,000.0
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt | Debt Instrument, Conversion Terms, Scenario One
Debt Instrument [Line Items]
Threshold percentage of stock price trigger			130.00%
Threshold trading days | day			20
Threshold consecutive trading days | day			30
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt | Debt Instrument, Conversion Terms, Scenario Two
Debt Instrument [Line Items]
Threshold percentage of stock price trigger			98.00%
Threshold trading days | day			5
Threshold consecutive trading days | day			10
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt | Debt Instrument, Conversion Terms, Scenario Three
Debt Instrument [Line Items]
Threshold consecutive trading days | day			10
3.375% Exchangeable Notes, due June 1, 2029 | Senior Notes
Debt Instrument [Line Items]
Conversion ratio	0.0082298		0.008206
5.00% Notes, due October 1, 2029
Debt Instrument [Line Items]
Stated interest rate	5.00%				5.00%			5.00%	5.00%
Aggregate borrowing amount					$ 300,000,000
Unamortized debt issuance costs	$ 0							$ 0
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default					25.00%
Capitalized debt issuance costs					$ 4,100,000
5.50% Notes, due July 15, 2030
Debt Instrument [Line Items]
Stated interest rate	5.50%							5.50%	5.50%
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default											25.00%
5.50% Notes, due July 15, 2030 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate											5.50%
Aggregate borrowing amount											$ 300,000,000
Unamortized debt issuance costs	$ 100,000							$ 100,000			$ 6,200,000
3.875% Notes, due March 15, 2031
Debt Instrument [Line Items]
Stated interest rate	3.875%							3.875%	3.90%
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default				25.00%
3.875% Notes, due March 15, 2031 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate				3.875%
Aggregate borrowing amount				$ 500,000,000
Unamortized debt issuance costs	$ 1,100,000			$ 7,600,000				$ 1,100,000
3.875% Notes, due March 15, 2031 | Senior Notes | Prior to July 15, 2025
Debt Instrument [Line Items]
Redemption price percentage				100.00%
3.875% Notes, due March 15, 2031 | Senior Notes | Before July, 2023
Debt Instrument [Line Items]
Redemption price percentage				35.00%

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