SUMMARIZED FINANCIAL INFORMATION OF ANIXTER INC - CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Detail) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 28, 2018	[1]	Sep. 28, 2018	[2]	Jun. 29, 2018	[3]	Mar. 30, 2018	[4]	Dec. 29, 2017	[5]	Sep. 29, 2017	[6]	Jun. 30, 2017	[7]	Mar. 31, 2017	[8]	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 2,119.1		$ 2,179.0		$ 2,137.9		$ 1,964.2		$ 2,013.8		$ 2,016.4		$ 2,001.4		$ 1,895.8		$ 8,400.2	$ 7,927.4	$ 7,622.8
Operating income	87.3		89.5		71.3		61.6		80.6		80.8		82.6		68.9		309.7	312.9	295.5
Income from continuing operations before income taxes	59.9		68.6		49.0		45.7		61.5		62.4		63.8		49.9		223.2	237.6	197.5
Net loss from discontinued operations																	0.0	0.0	(0.6)
Net income	$ 41.8		$ 47.6		$ 34.8		$ 32.1		$ 0.4		$ 37.6		$ 40.1		$ 30.9		156.3	109.0	120.5
Comprehensive income																	97.2	149.6	100.1
Anixter Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales																	8,400.2	7,927.4	7,622.8
Operating income																	316.4	319.4	301.8
Income from continuing operations before income taxes																	229.1	243.2	202.6
Net loss from discontinued operations																	0.0	0.0	(0.6)
Net income																	160.9	112.6	123.8
Comprehensive income																	$ 101.8	$ 153.2	$ 103.4

[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.