Microwave Communications Equipment Segment Impairment and Restructuring - Summary of Reconciliation of Amounts Accrued and Paid Under Consolidation Plan (Detail) (Severance and Other Payroll [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014
Severance and Other Payroll [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 0
Costs accrued	524
Amounts paid or charged	(249)
Impact of currency exchange	(44)
Ending balance	$ 231