SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 28, 2018 USD ($)		Sep. 28, 2018 USD ($)	[2]	Jun. 29, 2018 USD ($)	[3]	Mar. 30, 2018 USD ($)	[4]	Dec. 29, 2017 USD ($)		Sep. 29, 2017 USD ($)	[6]	Jun. 30, 2017 USD ($)	[7]	Mar. 31, 2017 USD ($)	[8]	Dec. 28, 2018 USD ($) shares	Dec. 29, 2017 USD ($) shares	Dec. 30, 2016 USD ($) shares
Summary Of Significant Accounting Policies [Line Items]
Fiscal year term																	52 weeks	52 weeks	52 weeks
Cash and cash equivalent maturity period maximum																	3 months
Allowance for doubtful accounts	$ 39.9								$ 43.8								$ 39.9	$ 43.8
Provision for doubtful accounts																	8.5	10.0	$ 20.1
Inventories	1,440.4								1,238.7								1,440.4	1,238.7
Inventory valuation reserves	51.5								49.5								51.5	49.5
Property and equipment	163.3								154.3								163.3	154.3
Depreciation																	31.7	28.2	27.9
Capitalized costs for computer software, net	$ 64.7								61.6								64.7	61.6
Capitalized costs for computer software, amortization																	6.6	5.5	3.7
Interest costs capitalized																	0.1	0.3	0.7
Impairment of intangible assets																	0.0	5.7	0.0
Average amortization of intangible assets																	$ 33.5
Years of average amortization of intangible assets																	5 years
Rate of foreign currency denominated accounts not hedged																	100.00%
Number of products	600,000																600,000
Reserve for returns and credits provided to customers																	$ 35.0	35.9
Deferred revenue, current	$ 17.2								9.5								17.2	9.5
Recognition of deferred revenue																	7.4
Advertising and promotion costs																	15.8	10.6	12.4
Shipping and handling costs	1,689.1	[1]	$ 1,754.9		$ 1,718.8		$ 1,579.4		1,615.4	[5]	$ 1,619.2		$ 1,605.7		$ 1,516.1		$ 6,742.2	$ 6,356.4	$ 6,074.8
Percentage threshold for tax benefit recognized																	50.00%
Stock options and units | shares																	0.3	0.4	0.2
Gross [Member]
Summary Of Significant Accounting Policies [Line Items]
Notional amount of foreign currency forward contracts	96.3								246.3								$ 96.3	$ 246.3
Net [Member]
Summary Of Significant Accounting Policies [Line Items]
Notional amount of foreign currency forward contracts	75.7								125.7								75.7	125.7
Equipment And Computer Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment	125.8								115.5								125.8	115.5
Building and Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment	36.5								36.6								36.5	36.6
Land [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment	$ 1.0								$ 2.2								$ 1.0	2.2
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Minimum margin of fair value in excess of carrying value	30.00%																30.00%
Number of days between performance obligation satisfaction and payment																	30 days
Minimum [Member] | Equipment And Computer Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life																	2 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days between performance obligation satisfaction and payment																	60 days
Maximum [Member] | Equipment And Computer Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life																	20 years
Maximum [Member] | Building and Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life																	40 years
Shipping and Handling [Member]
Summary Of Significant Accounting Policies [Line Items]
Shipping and handling costs																	$ 139.7	$ 119.1	$ 113.9

[1] In the fourth quarter of 2018, "Operating income" includes $8.7 million of intangible asset amortization and $0.2 million of U.K. facility relocation costs. "Income before income taxes" includes a $4.6 million loss on extinguishment of debt.

[2] In the third quarter of 2018, "Operating income" includes $9.6 million of intangible asset amortization, a restructuring charge of $0.2 million, $0.3 million of acquisition and integration costs and $0.2 million of U.K. facility relocation costs.

[3] In the second quarter of 2018, "Operating income" includes $9.7 million of intangible asset amortization, a restructuring charge of $9.2 million, $2.3 million of acquisition and integration costs, $2.6 million of CEO retirement agreement expense and $0.4 million of U.K. facility relocation costs.

[4] In the first quarter of 2018, "Operating income" includes $9.3 million of intangible asset amortization, $0.3 million of acquisition and integration costs and $0.2 million of U.K. facility relocation costs.

[5] In the fourth quarter of 2017, "Operating income" includes $9.0 million of intangible asset amortization, $1.5 million of acquisition and integration costs and an intangible asset impairment charge of $5.7 million.

[6] In the third quarter of 2017, "Operating income" includes $9.1 million of intangible asset amortization and $0.8 million of acquisition and integration costs.

[7] In the second quarter of 2017, "Operating income" includes $9.0 million of intangible asset amortization.

[8] In the first quarter of 2017, "Operating income" includes $9.0 million of intangible asset amortization.