SUMMARIZED FINANCIAL INFORMATION OF ANIXTER INC - CONDENSED CONSOLIDATED BALANCE SHEETS (Detail) - USD ($) $ in Millions	Sep. 27, 2019	Jun. 28, 2019	Dec. 29, 2018	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Dec. 29, 2017
Assets:
Current assets	$ 3,139.4			$ 3,172.0
Property and equipment, net	167.1			163.3
Operating leases	252.8		$ 244.1	0.0
Goodwill	833.3			832.0
Intangible assets, net	365.9			392.9
Other assets	110.0			92.9
Total assets	4,868.5			4,653.1
Liabilities and Stockholders' Equity:
Current liabilities	1,640.2			1,629.0
Long-term debt	1,083.2			1,252.7
Operating lease obligations	201.0			0.0
Other liabilities	192.7			201.0
Stockholders' equity	1,751.4	$ 1,697.9		1,570.4	$ 1,564.1	$ 1,507.4	$ 1,459.0
Total liabilities and stockholders’ equity	4,868.5			4,653.1
Anixter Inc. [Member]
Assets:
Current assets	3,137.1			3,171.6
Property and equipment, net	172.0			169.1
Operating leases	244.0			0.0
Goodwill	833.3			832.0
Intangible assets, net	365.9			392.9
Other assets	110.0			92.9
Total assets	4,862.3			4,658.5
Liabilities and Stockholders' Equity:
Current liabilities	1,639.5			1,630.3
Long-term debt	1,089.9			1,260.7
Operating lease obligations	194.2			0.0
Other liabilities	191.1			199.6
Stockholders' equity	1,747.6			1,567.9
Total liabilities and stockholders’ equity	$ 4,862.3			$ 4,658.5