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Goodwill and Purchased Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2016
Dec. 25, 2015
Dec. 26, 2014
Finite-Lived Intangible Assets [Line Items]      
Amortization of finite-lived intangibles $ 5,758 $ 6,212 $ 4,884
UCT Trade name [Member]      
Finite-Lived Intangible Assets [Line Items]      
Value of UCT tradename 9,000    
Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of finite-lived intangibles 2,400    
Miconex [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of finite-lived intangibles   $ 500  
Trade Name [Member] | American Integration Technologies LLC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Wrote off remaining book value of tradename intangible acquired $ 500    
Minimum [Member] | Trade Name [Member] | American Integration Technologies LLC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 6 years    
Minimum [Member] | Trade Name [Member] | Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 6 years    
Minimum [Member] | Customer Relationships [Member] | American Integration Technologies LLC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 6 years    
Minimum [Member] | Customer Relationships [Member] | Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 7 years    
Minimum [Member] | Customer Relationships [Member] | Miconex [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 7 years    
Minimum [Member] | Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 7 years    
Minimum [Member] | Intellectual Properties/Know-How [Member] | Miconex [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 7 years    
Maximum [Member] | Trade Name [Member] | American Integration Technologies LLC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 10 years    
Maximum [Member] | Trade Name [Member] | Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 10 years    
Maximum [Member] | Customer Relationships [Member] | American Integration Technologies LLC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 10 years    
Maximum [Member] | Customer Relationships [Member] | Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 12 years    
Maximum [Member] | Customer Relationships [Member] | Miconex [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 12 years    
Maximum [Member] | Intellectual Properties/Know-How [Member] | Marchi Thermal Systems Inc [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 12 years    
Maximum [Member] | Intellectual Properties/Know-How [Member] | Miconex [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic lives for intangible assets 12 years    
American Integration Technologies Reporting Units [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Terminal growth rate 4.00%    
Discount rate 12.00%    
American Integration Technologies Reporting Units [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Terminal growth rate 4.80%    
Discount rate 17.00%