Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended			0 Months Ended
	Sep. 27, 2014	Sep. 27, 2014	Dec. 28, 2013		Oct. 01, 2014 Subsequent Event [Member]	Oct. 01, 2014 Semiconductor Equipment [Member] Subsequent Event [Member]	Oct. 01, 2014 Microwave Communications Equipment [Member] Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Net of allowance for doubtful accounts	$ 300,000	$ 300,000	$ 500,000
Goodwill impairment					0
Percent of fair value exceeding carrying value						35.00%	17.00%
Number of common stock shares excluded from computation of diluted income per share	1,346,000	1,953,000
Deferred revenue	22,000,000	22,000,000	7,400,000
Deferred profit	11,240,000	11,240,000	6,066,000	[1]
Accumulated other comprehensive income (loss)	$ (2,153,000)	$ (2,153,000)	$ 6,651,000	[1]

[1] Derived from December 28, 2013 audited financial statements