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. 29, 2017	[1]	Sep. 29, 2017	[2]	Jun. 30, 2017	[3]	Mar. 31, 2017	[4]	Dec. 30, 2016	[5]	Sep. 30, 2016	[6]	Jul. 01, 2016	[7]	Apr. 01, 2016	[8]	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 2,013.8		$ 2,016.4		$ 2,001.4		$ 1,895.8		$ 1,894.6		$ 1,956.3		$ 1,955.7		$ 1,816.2		$ 7,927.4	$ 7,622.8	$ 6,190.5
Operating income	80.4		81.0		82.7		69.0		81.0		87.3		56.7		60.3		313.1	285.3	267.8
Income from continuing operations before income taxes	61.5		62.4		63.8		49.9		58.6		65.4		36.1		37.4		237.6	197.5	182.9
Net (loss) income from discontinued operations									0.0		0.1		(0.3)		(0.4)		0.0	(0.6)	30.7
Net income	$ 0.4		$ 37.6		$ 40.1		$ 30.9		$ 36.8		$ 40.4		$ 20.5		$ 22.8		109.0	120.5	127.6
Comprehensive income																	149.6	100.1	35.1
Anixter Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales																	7,927.4	7,622.8	6,190.5
Operating income																	319.6	291.6	273.8
Income from continuing operations before income taxes																	243.2	202.6	187.9
Net (loss) income from discontinued operations																	0.0	(0.6)	30.7
Net income																	112.6	123.8	130.7
Comprehensive income																	$ 153.2	$ 103.4	$ 38.2

[1] 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.

[2] 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.

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

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

[5] In the fourth quarter of 2016, "Operating income" includes $9.0 million of intangible asset amortization and $0.8 million of acquisition and integration costs.

[6] In the third quarter of 2016, "Operating income" includes $9.4 million of intangible asset amortization, $0.7 million of acquisition and integration costs and a restructuring reversal of $0.2 million.

[7] In the second quarter of 2016, "Operating income" includes $9.5 million of intangible asset amortization, $5.6 million of restructuring charges, $7.6 million of Latin America bad debt provision, $1.4 million of acquisition and integration costs and $9.6 million related to a settlement of pension obligation in the UK.

[8] In the first quarter of 2016, "Operating income" includes $9.7 million of intangible asset amortization and $2.2 million of acquisition and integration costs.