Components of purchase price at fair value (parenthetical) (Detail) - shares		3 Months Ended
Jun. 02, 2015	Jan. 31, 2016
Rel-Tech Electronics, Inc
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	50,467
Comnet Telecom Supply Inc
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		252,381

Number of shares of equity interests issued or issuable to acquire entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration