SUMMARIZED FINANCIAL INFORMATION OF ANIXTER INC - CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 2,222.2	$ 2,179.0	$ 6,593.3	$ 6,281.1
Operating income	101.8	89.5	282.1	222.4
Income before income taxes	82.1	68.6	223.7	163.3
Net income	59.3	47.6	161.9	114.5
Comprehensive income	46.3	54.8	166.1	93.6
Anixter Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net sales	2,222.2	2,179.0	6,593.3	6,281.1
Operating income	103.5	91.1	287.1	227.5
Income before income taxes	83.7	70.1	228.2	167.8
Net income	60.8	49.1	166.3	119.0
Comprehensive income	$ 47.9	$ 56.3	$ 170.6	$ 98.1