Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended
	Oct. 01, 2014	Mar. 28, 2015	Dec. 27, 2014		Dec. 27, 2014
Significant Accounting Policies [Line Items]
Net of allowance for doubtful accounts		$ 200,000	$ 300,000		$ 300,000
Goodwill impairment	0
Impairment of goodwill			3,055,000
Foreign currency gains		200,000
Deferred revenue		12,000,000	11,300,000		11,300,000
Deferred profit		7,723,000	7,445,000	[1]	7,445,000	[1]
Accumulated other comprehensive income (loss)		(19,112,000)	(10,714,000)	[1]	(10,714,000)	[1]
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
Percent of fair value exceeding carrying value	17.00%
Impairment of goodwill			3,055,000		3,100,000
Impairment of other assets					$ 1,900,000

[1] Derived from December 27, 2014 audited financial statements