Employee Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Employee Retirement Plans [Abstract]
Employee Retirement Plans Maximum Contribution Percentage Of Earnings	100.00%
401K Plan employer contribution expense in US	$ 5.8	$ 5.1
Defined Contribution Plan, Cost Recognized, outside US	$ 19.7	$ 16.2	$ 16.7

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration