COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 03, 2020	Jul. 03, 2020	Sep. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 8.6	$ 24.0
Finance lease cost:
Amortization of right-of-use assets	0.2	0.5
Interest on lease liabilities	0.1	0.4
Variable lease cost	3.7	12.4
Total lease cost	12.6	37.3
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for leases		25.0
Operating leases:
Operating right-of-use assets	123.6	123.6	$ 0.0
Accrued liabilities	26.2	26.2
Long-term lease liabilities	102.6	102.6	$ 0.0
Total lease liabilities	128.8	128.8
Finance leases:
Property, plant, and equipment, net	12.0	12.0
Accrued liabilities	3.2	3.2
Other long-term liabilities	8.9	8.9
Total lease liabilities	$ 12.1	$ 12.1
Weighted average remaining lease term - operating leases	7 years 3 months 18 days	7 years 3 months 18 days
Weighted average remaining lease term - finance leases	4 years 4 months 24 days	4 years 4 months 24 days
Weighted average discount rate - operating leases (percent)	4.90%	4.90%
Weighted average discount rate - finance leases (percent)	4.00%	4.00%
Operating Leases
Remainder of 2020	$ 7.9	$ 7.9
2021	29.9	29.9
2022	24.3	24.3
2023	19.2	19.2
2024	14.7	14.7
Thereafter	67.2	67.2
Total minimum lease payments	163.2	163.2
Less: imputed interest	34.4	34.4
Total lease liabilities	128.8	128.8
Finance leases
Remainder of 2020	0.9	0.9
2021	3.5	3.5
2022	2.9	2.9
2023	2.9	2.9
2024	1.1	1.1
Thereafter	1.9	1.9
Total minimum lease payments	13.2	13.2
Less: imputed interest	1.1	1.1
Total lease liabilities	$ 12.1	$ 12.1
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent