SUMMARIZED FINANCIAL INFORMATION OF ANIXTER INC - CONDENSED CONSOLIDATED BALANCE SHEETS (Detail) - USD ($) $ in Millions	Mar. 29, 2019	Dec. 29, 2018	Dec. 28, 2018	Mar. 30, 2018	Dec. 29, 2017
Assets:
Current assets	$ 3,158.1		$ 3,172.0
Property and equipment, net	161.7		163.3
Operating leases	234.2	$ 244.1	0.0
Goodwill	834.9		832.0
Intangible assets, net	385.3		392.9
Other assets	95.5		92.9
Total assets	4,869.7		4,653.1
Liabilities and Stockholders' Equity:
Current liabilities	1,501.6		1,629.0
Long-term debt	1,368.3		1,252.7
Operating lease obligations	181.4		0.0
Other liabilities	197.7		201.0
Stockholders' equity	1,620.7		1,570.4	$ 1,491.9	$ 1,459.0
Total liabilities and stockholders’ equity	4,869.7		4,653.1
Anixter Inc. [Member]
Assets:
Current assets	3,156.4		3,171.6
Property and equipment, net	167.2		169.1
Operating leases	224.5		0.0
Goodwill	834.9		832.0
Intangible assets, net	385.3		392.9
Other assets	95.6		92.9
Total assets	4,863.9		4,658.5
Liabilities and Stockholders' Equity:
Current liabilities	1,500.7		1,630.3
Long-term debt	1,378.0		1,260.7
Operating lease obligations	171.6		0.0
Other liabilities	196.4		199.6
Stockholders' equity	1,617.2		1,567.9
Total liabilities and stockholders’ equity	$ 4,863.9		$ 4,658.5