SUMMARIZED FINANCIAL INFORMATION OF ANIXTER INC - CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Detail) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Jan. 03, 2020	[1]	Sep. 27, 2019	[2]	Jun. 28, 2019	[3]	Mar. 29, 2019	[4]	Dec. 28, 2018	[5]	Sep. 28, 2018	[6]	Jun. 29, 2018	[7]	Mar. 30, 2018	[8]	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 2,252.3		$ 2,222.2		$ 2,262.6		$ 2,108.5		$ 2,119.1		$ 2,179.0		$ 2,137.9		$ 1,964.2		$ 8,845.6	$ 8,400.2	$ 7,927.4
Operating income	85.4		101.8		105.7		74.6		87.3		89.5		71.3		61.6		367.5	309.7	312.9
Income before income taxes	69.7		82.1		85.6		56.0		59.9		68.6		49.0		45.7		293.4	223.2	237.6
Net income	$ 101.0		$ 59.3		$ 63.5		$ 39.1		$ 41.8		$ 47.6		$ 34.8		$ 32.1		262.9	156.3	109.0
Comprehensive income																	272.7	97.2	149.6
Anixter Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales																	8,845.6	8,400.2	7,927.4
Operating income																	374.9	316.4	319.4
Income before income taxes																	300.1	229.1	243.2
Net income																	268.1	160.9	112.6
Comprehensive income																	$ 277.9	$ 101.8	$ 153.2

[1] In the fourth quarter of 2019, "Operating income" includes $8.6 million of intangible asset amortization and $12.8 million of merger costs. "Net income" includes a $45.9 million tax benefit related to the reversal of deferred income tax valuation allowances, partially offset by $0.8 million of tax expense related to prior year tax positions.

[2] In the third quarter of 2019, "Operating income" includes $8.8 million of intangible asset amortization.

[3] In the second quarter of 2019, "Operating income" includes $8.8 million of intangible asset amortization.

[4] In the first quarter of 2019, "Operating income" includes $8.8 million of intangible asset amortization and a reversal of acquisition and integration costs of $0.3 million.

[5] 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.

[6] 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.

[7] 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.

[8] 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.