Pension Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income Loss (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Compensation And Retirement Disclosure [Abstract]
Net loss, tax	$ 96.5	$ 147.1
Prior service cost, tax	$ 2.3	$ 2.5

Pension And Other Postretirement Benefit Plans Accumulated Other Comprehensive Income Loss Net Prior Service Cost Credit Tax

No definition available.

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Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant