FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Detail) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 26, 2024 Agreement	Apr. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2022 USD ($) Agreement	Aug. 01, 2022 USD ($)
StruXure Outdoor, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payment arrangements, range of outcomes, value, low		$ 0.0
Contingent payment arrangements, range of outcomes, value, high		13.9
Contingent consideration		9.5				$ 12.7
Contingent payment compensation expense	$ 3.2	$ 9.5
Contingent liability					$ 12.7
INTEX Millwork Solutions, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payment arrangements, range of outcomes, value, low									$ 0.0
Contingent payment arrangements, range of outcomes, value, high									6.2
Contingent consideration							$ 6.2		$ 5.8
Contingent liability	6.2
INTEX Millwork Solutions, LLC | Selling, General and Administrative Expense
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value adjustment for contingent consideration	$ 0.4
Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of interest rate swap agreements | Agreement				2				2
Derivative, notional amount								$ 150.0
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, before tax			$ 1.9
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, after tax			$ 1.4
Derivatives | Interest Rate Swap 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fixed interest rate								4.39%
Derivatives | Interest Rate Swap 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fixed interest rate								4.48%