Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Oct. 01, 2014	Dec. 27, 2014	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Significant Accounting Policies [Line Items]
Number of common stock shares excluded from computation of diluted income per share		1,771,000
Net of allowance for doubtful accounts		$ 300,000	$ 300,000	$ 500,000
Goodwill impairment	0	5,000,000
Impairment of goodwill		3,055,000
Product warrant period		12- to 36-months
Largest amount of tax benefit likely of being realize upon settlement		50.00%
Minority portion of purchase price payable upon customer acceptance		20.00%
Majority portion of revenue recognized upon shipment and transfer of title		80.00%
Deferred revenue		11,300,000	11,300,000	7,400,000
Deferred profit		7,445,000	7,445,000	6,066,000
Foreign currency gains		2,000,000
Accumulated other comprehensive income (loss)		(10,714,000)	(10,714,000)	6,651,000
Decrease in accumulated other comprehensive income		14,100,000	14,100,000
Semiconductor Equipment [Member]
Significant Accounting Policies [Line Items]
Percent of fair value exceeding carrying value	35.00%
Microwave Communications Equipment [Member]
Significant Accounting Policies [Line Items]
Goodwill impairment		5,000,000	5,000,000
Percent of fair value exceeding carrying value	17.00%
Impairment of goodwill		3,055,000	3,055,000
Impairment of other assets			1,900,000
Minimum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful lives		30 years
Minimum [Member] | Building Improvements [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful lives		5 years
Minimum [Member] | Machinery, Equipment and Software [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful lives		3 years
Maximum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful lives		40 years
Maximum [Member] | Building Improvements [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful lives		15 years
Maximum [Member] | Machinery, Equipment and Software [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful lives		10 years
Reserve for Excess and Obsolete Inventories [Member]
Significant Accounting Policies [Line Items]
Charges to cost of sales		$ 3,900,000		$ 7,800,000	$ 8,600,000