Segment Information Revenue and Accounts Receivable by major customer (Details)	12 Months Ended
Jan. 29, 2017	Jan. 31, 2016
Revenue, Major Customer [Line Items]
Revenue from significant customers (in percent)	12.00%	11.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration