FAIR VALUE MEASUREMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2026	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding balance	$ 162,039	$ 162,039		$ 0
Paid-in-kind interest		939	$ 0
Fair value of insurance contracts	5,449	5,449
Chinese Yuan Contracts | Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	50,913	$ 50,913
Weighted average rate (in dollars per share)		$ 6.79
Deferred gain (loss), foreign currency translation adjustment, before tax	18	$ 18
Deferred gain (loss), foreign currency translation adjustment, net of tax	13	13
Gain reclassified for settled contracts	159
Gain on hedging activity		$ 481
Chinese Yuan Contracts | Designated as Hedging Instrument | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of contract (in days)		31 days
Chinese Yuan Contracts | Designated as Hedging Instrument | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of contract (in days)		92 days
Australian Dollar Contracts | Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	290,000	$ 290,000
Weighted average rate (in dollars per share)		$ 0.70
Deferred gain (loss), foreign currency translation adjustment, before tax	2,795	$ 2,795
Deferred gain (loss), foreign currency translation adjustment, net of tax	2,124	2,124
Fair Value, Inputs, Level 1 | Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	285,000	285,000
Senior notes due 2028 | Fair Value, Inputs, Level 1 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 972,338	$ 972,338