SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Indefinite and Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 03, 2020	Dec. 28, 2018
Intangible Assets [Line Items]
Gross carrying amount	$ 565.1	$ 560.4
Accumulated amortization	(203.9)	(167.5)
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross carrying amount	503.6	500.1
Accumulated amortization	(176.4)	(143.7)
Exclusive Supplier Agreement [Member]
Intangible Assets [Line Items]
Gross carrying amount	22.3	22.1
Accumulated amortization	(5.6)	(4.5)
Trade Names [Member]
Intangible Assets [Line Items]
Gross carrying amount, finite trade names	22.6	21.8
Accumulated amortization	(13.5)	(12.6)
Non-compete Agreements [Member]
Intangible Assets [Line Items]
Gross carrying amount	9.2	9.2
Accumulated amortization	(7.9)	(6.5)
Intellectual Property [Member]
Intangible Assets [Line Items]
Gross carrying amount	2.5	2.3
Accumulated amortization	(0.5)	(0.2)
Indefinite-Lived Trade Names [Member]
Intangible Assets [Line Items]
Gross carrying amount	$ 4.9	$ 4.9
Minimum [Member] \| Customer Relationships [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years
Minimum [Member] \| Trade Names [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] \| Non-compete Agreements [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member] \| Customer Relationships [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] \| Exclusive Supplier Agreement [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	21 years
Maximum [Member] \| Trade Names [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum [Member] \| Non-compete Agreements [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member] \| Intellectual Property [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years

Intangible Assets [Line Items]

No definition available.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date of the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a reasonably expected period of economic benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

+ References

No definition available.

+ Details

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- Details

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- Details

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