Segment and Related Information - Financial Information by Industry Segment (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended	3 Months Ended
Oct. 01, 2014	Dec. 27, 2014	Dec. 27, 2014
Segment Reporting Information [Line Items]
Impairment of asset	$ 0	$ 5,000
Microwave Communications Equipment [Member]
Segment Reporting Information [Line Items]
Impairment of asset		$ 5,000	$ 5,000

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

No definition available.

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