Acquisitions - Summary of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2016	Dec. 25, 2015
Miconex [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life	7 years 6 months
Purchased intangible assets	$ 8,800
Miconex [Member] | Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life		7 years 6 months
Purchased intangible assets	8,800	$ 8,800
Marchi Thermal Systems Inc [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets	$ 23,370
Marchi Thermal Systems Inc [Member] | Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life	10 years	10 years
Purchased intangible assets	$ 9,900	$ 9,900
Marchi Thermal Systems Inc [Member] | Trade Name [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life	6 years	6 years
Purchased intangible assets	$ 1,170	$ 1,170
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets	$ 12,300	$ 12,300
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member] | Minimum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life	8 years	8 years
Marchi Thermal Systems Inc [Member] | Intellectual Properties/Know-How [Member] | Maximum [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Purchased intangible assets, Useful Life	12 years	12 years