Microwave Communications Equipment Segment Impairment and Restructuring - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended	3 Months Ended
	Oct. 01, 2014	Dec. 27, 2014	Dec. 27, 2014
Restructuring Cost and Reserve [Line Items]
Goodwill impairment	$ 0	$ 5,000,000
Impairment of goodwill		3,055,000
Broadcast Microwave Services [Member]
Restructuring Cost and Reserve [Line Items]
Severance and one time termination benefits		500,000
Broadcast Microwave Services [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Severance and one time termination benefits		100,000
Broadcast Microwave Services [Member] | Selling, General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Severance and one time termination benefits		200,000
Broadcast Microwave Services [Member] | Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Severance and one time termination benefits		200,000
Semiconductor Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Percent of fair value exceeding carrying value	35.00%
Microwave Communications Equipment [Member]
Restructuring Cost and Reserve [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