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DERIVATIVES - Narrative (Details) € in Millions	9 Months Ended
DERIVATIVES - Narrative (Details) € in Millions	Jun. 30, 2024 USD ($)	Jun. 30, 2024 EUR (€)	Sep. 30, 2023 USD ($)
Derivative [Line Items]
Stated interest rate	5.30%	5.30%	5.30%
4.00% Notes, due October 1, 2026
Derivative [Line Items]
Aggregate principal amount			$ 448,800,000
Stated interest rate	4.00%	4.00%	4.00%
Cash Flow Hedge \| Foreign exchange contracts
Derivative [Line Items]
Derivative net gain (loss) estimated to be reclassified from AOCI into earnings over the next 12 months	$ 1,400,000
Notional value	339,500,000		$ 320,200,000
Fair Value Hedge
Derivative [Line Items]
Posted cash collateral	0		0
Posted standby letters of credit	0		0
Net investment hedge \| 4.00% Notes, due October 1, 2026
Derivative [Line Items]
Unrealized gain	11,900,000
Not Designated as Hedging \| Foreign exchange contracts
Derivative [Line Items]
Notional value	$ 289,600,000		$ 671,500,000
SBI \| Net investment hedge \| 4.00% Notes, due October 1, 2026
Derivative [Line Items]
Aggregate principal amount \| €		€ 425.0
Stated interest rate	4.00%	4.00%