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DEBT - Narrative (Details)							1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($)	May 09, 2024 USD ($) $ / shares	May 01, 2024 USD ($)	Aug. 01, 2023 trading_day	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	May 31, 2024 USD ($) trading_day $ / shares	Dec. 31, 2021 USD ($)	Jul. 31, 2020 USD ($) trading_day $ / shares	Sep. 30, 2024 USD ($) trading_day day $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) trading_day day $ / shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2028 USD ($)	May 08, 2024 USD ($)	May 07, 2024 USD ($)	Jan. 07, 2022 USD ($)	May 02, 2017 USD ($)
Debt Instrument [Line Items]
Proceeds from Term loan A facility												$ 0	$ 149,550,000
Aggregate purchase																$ 150,000,000	$ 150,000,000
Gain (loss) on early extinguishment of debt										$ 0	$ 0	$ 7,518,000	(16,926,000)
Share price (in dollars per share) | $ / shares		$ 29.86								$ 15.05		$ 15.05
Purchase of capped calls												$ 20,112,000
Additional Paid-In Capital
Debt Instrument [Line Items]
Purchase of capped calls		$ 26,700,000										$ 20,112,000
Term loan A facility maturing March 2028
Debt Instrument [Line Items]
Weighted average interest rate, at point in time										7.95%		7.95%
Term loan A facility maturing March 2028 | Minimum | Base Rate
Debt Instrument [Line Items]
Net leverage ratio										2.00%		2.00%
Term loan A facility maturing March 2028 | Minimum | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Net leverage ratio										3.00%		3.00%
Term loan A facility maturing March 2028 | Maximum | Base Rate
Debt Instrument [Line Items]
Net leverage ratio										2.75%		2.75%
Term loan A facility maturing March 2028 | Maximum | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Net leverage ratio										3.75%		3.75%
Term loan A facility maturing March 2028 | Term Loan
Debt Instrument [Line Items]
Discount rate						0.30%
Debt instrument, face amount						$ 150,000,000
Proceeds from Term loan A facility						149,600,000
Debt instrument, unamortized discount						400,000				$ 303,000		$ 303,000		$ 373,000
Periodic payment, principal					$ 2,800,000									2,800,000
Leverage ratio, maximum										3.00		3.00
Leverage ratio, minimum										1.50		1.50
Required unrestricted cash and cash equivalents net												$ 300,000,000
Required unrestricted cash and cash equivalents												500,000,000
Prepayments of debt												$ 200,000,000
Days prior maturity date | day										91		91
Repayments of debt												$ 8,400,000		30,600,000
Long-term debt										$ 107,024,000		$ 107,024,000		115,202,000
Term loan A facility maturing March 2028 | Term Loan | Forecast
Debt Instrument [Line Items]
Periodic payment, principal	$ 3,800,000
Balloon payment to be paid															$ 85,300,000
Term Loan B Facility Due December 2026 | Term Loan
Debt Instrument [Line Items]
Discount rate								3.00%
Debt instrument, face amount								$ 375,000,000
Proceeds from Term loan A facility								363,800,000
Debt instrument, unamortized discount								$ 11,200,000
Repayments of debt						149,600,000
Repayment of debt principal						296,900,000
Gain (loss) on early extinguishment of debt						$ (16,900,000)
Prepayment fee percentage						2.00%
2.125% Convertible senior notes due May 2029 | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount							$ 287,500,000
Stated interest rate (as a percent)							2.125%			2.125%		2.125%
Threshold percentage stock price trigger							130.00%
Threshold trading days | trading_day							20
Threshold consecutive trading days | trading_day							30
Settlement period - convertible debt conversion request							50 days
Initial conversion price of notes into common stock (in dollars per share) | $ / shares							$ 39.56			$ 39.56		$ 39.56
Convertible debt, premium on common stock							32.50%
Long-term debt										$ 278,867,000		$ 278,867,000		0
Initial conversion rate							0.0252752
Market price of principal amount of notes										0.757		0.757
2.125% Convertible senior notes due May 2029 | Unsecured Debt | Terms one
Debt Instrument [Line Items]
Threshold percentage stock price trigger												130.00%
Threshold trading days | trading_day												20
Threshold consecutive trading days | trading_day												30
Required principal repayment on conversion										$ 287,500,000		$ 287,500,000
2.125% Convertible senior notes due May 2029 | Unsecured Debt | Term two
Debt Instrument [Line Items]
Threshold trading days | trading_day												5
Threshold consecutive trading days | trading_day												5
Percentage of last reported sale price of common stock												98.00%
2.125% Convertible senior notes due May 2029 | Unsecured Debt | Term three
Debt Instrument [Line Items]
Threshold percentage stock price trigger												130.00%
Threshold trading days | trading_day												20
Threshold consecutive trading days | trading_day												30
Scheduled trading day | trading_day										50		50
Repurchase price percent												100.00%
2.125% Convertible senior notes due May 2029 | Convertible Debt | Capped Call
Debt Instrument [Line Items]
Cap price (in USD per share) | $ / shares		$ 53.75
Premium		80.00%
0.750% Convertible senior notes due August 2025
Debt Instrument [Line Items]
Payment of debt												$ 190,994,000	0
0.750% Convertible senior notes due August 2025 | Debt Redemption Terms on or After August 1, 2023
Debt Instrument [Line Items]
Threshold percentage stock price trigger				130.00%
Threshold trading days | trading_day				20
Threshold consecutive trading days | trading_day				30
Scheduled trading day | trading_day				40
Redemption principal price percent				100.00%
0.750% Convertible senior notes due August 2025 | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount									$ 402,500,000
Gain (loss) on early extinguishment of debt							$ 7,500,000
Stated interest rate (as a percent)									0.75%	0.75%		0.75%
Settlement period - convertible debt conversion request									40 days
Initial conversion price of notes into common stock (in dollars per share) | $ / shares									$ 71.78	$ 71.78		$ 71.78
Convertible debt, premium on common stock									32.50%
Share price (in dollars per share) | $ / shares									$ 54.17
Repurchased aggregate principal							200,000,000
Payment of debt							$ 191,400,000
Debt issued in private placement												$ 202,500,000
Long-term debt										$ 201,466,000		$ 201,466,000		398,594,000
Initial conversion rate												0.0139324
Market price of principal amount of notes										0.956		0.956
0.750% Convertible senior notes due August 2025 | Unsecured Debt | Debt Redemption Terms Prior to February 3, 2023
Debt Instrument [Line Items]
Threshold percentage stock price trigger									130.00%
Threshold trading days | trading_day									20
Threshold consecutive trading days | trading_day									30
3.375% Convertible senior notes due May 2024
Debt Instrument [Line Items]
Payment of debt												$ 8,641,000	$ 0
3.375% Convertible senior notes due May 2024 | Unsecured Debt
Debt Instrument [Line Items]
Repayments of debt			$ 8,600,000
Stated interest rate (as a percent)										3.375%		3.375%
Repurchase amount																		$ 192,600,000
Long-term debt										$ 0		$ 0		$ 8,641,000
3.375% Convertible senior notes due May 2024 | Unsecured Debt | Flexion
Debt Instrument [Line Items]
Debt instrument, face amount																			$ 201,300,000
Stated interest rate (as a percent)																			3.375%

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