COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Sep. 29, 2017
Commitments And Contingencies [Line Items]
Environmental cleanup costs, third-party claim costs, project management costs and legal costs	$ 0.2	$ 0.1
Receivables of past and future environmental-related expenditures	1.6		$ 1.6
Group A Sites
Commitments And Contingencies [Line Items]
Amount accrued for environmental remediation expense	1.0
Group A Sites | Minimum
Commitments And Contingencies [Line Items]
Estimate of loss	$ 1.0
Estimated time frames to resolve contingency related to environmental remediation contingencies, years	1 year
Group A Sites | Maximum
Commitments And Contingencies [Line Items]
Estimate of loss	$ 7.9
Estimated time frames to resolve contingency related to environmental remediation contingencies, years	30 years
Group B Sites
Commitments And Contingencies [Line Items]
Amount accrued for environmental remediation expense	$ 4.8
Estimated environmental remediation costs, best estimate, undiscounted	$ 5.6
Discount rate for environmental remediation costs, net of inflation (as a percent)	4.00%
Group B Sites | Minimum
Commitments And Contingencies [Line Items]
Estimate of loss	$ 3.5
Estimated time frames to resolve contingency related to environmental remediation contingencies, years	1 year
Group B Sites | Maximum
Commitments And Contingencies [Line Items]
Estimate of loss	$ 19.5
Estimated time frames to resolve contingency related to environmental remediation contingencies, years	30 years