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INCOME TAXES - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Contingency [Line Items]
Statutory tax rate		21.00%	21.00%	21.00%
Net operating loss carryforward		$ 52.0	$ 66.0
US and non-US Tax Credit Carryforward		$ 10.0
US and non-US tax credit carryforward expiration period		2025
Effect of unrecognized tax benefits on effective tax rate		$ 14.0	17.0
Accrual for income tax penalties and interest		4.0	6.0
Deferred Federal Income Tax Expense (Benefit)		(6.0)	$ 28.0	$ (17.0)
Undistributed Earnings of Foreign Subsidiaries		40.0
Forecast
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Expected Reduction	$ 2.0
State
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 816.0
Minimum
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Year		2025
Maximum
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Year		2044
UNITED KINGDOM | Foreign Country Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 65.0
GERMANY | Foreign Country Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 54.0

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