Goodwill and Purchased Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 24, 2016	Jun. 26, 2015	Jun. 24, 2016	Jun. 26, 2015	Dec. 25, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of finite-lived intangibles	$ 1,400	$ 1,400	$ 2,879	$ 2,492
Marchi Thermal Systems Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of finite-lived intangibles	$ 700		$ 1,100
Trade Name [Member] | American Integration Technologies LLC [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					6 years
Trade Name [Member] | American Integration Technologies LLC [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Trade Name [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					6 years
Trade Name [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Customer Relationships [Member] | American Integration Technologies LLC [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					6 years
Customer Relationships [Member] | American Integration Technologies LLC [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Customer Relationships [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Customer Relationships [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					12 years
Customer Relationships [Member] | Miconex [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Customer Relationships [Member] | Miconex [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					12 years
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					12 years
Intellectual Properties/Know-How [Member] | Miconex [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					7 years
Intellectual Properties/Know-How [Member] | Miconex [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated economic lives for intangible assets					12 years