Business Segment Information for Continuing Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Jul. 26, 2013	Jul. 27, 2012	Jul. 26, 2013	Jul. 27, 2012
Segment Reporting Information [Line Items]
Impairment charge against Racal Acoustics' goodwill	$ 3,454	$ 52,169	$ 3,454	$ 52,169

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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