Business Combinations - Additional Information (Details) - Hi-Tech - USD ($) $ in Thousands	6 Months Ended
Jul. 29, 2017	Jan. 28, 2017	Dec. 07, 2016
Business combinations
Total purchase consideration			$ 87,252
Restructuring charges		$ 3,782
Working Capital Adjustment To Goodwill	$ 149

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant