v3.8.0.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]      
Land $ 1,117,000 $ 1,044,000  
Buildings 1,976,000 1,846,000  
Leasehold improvements 6,530,000 5,429,000  
Machinery and equipment 190,209,000 142,244,000  
Computer equipment and software 41,345,000 34,156,000  
Furniture and fixtures 1,671,000 1,427,000  
Construction in process 8,969,000 7,995,000  
Property and equipment, gross 251,817,000 194,141,000  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 98,674,000 74,713,000  
Maturity period (less than) 90 days    
Foreign bank balance $ 6,035,000 5,892,000  
Allowance for doubtful accounts (1,121,000) (907,000)  
Proceeds from sale of trade receivables 214,527,000 200,643,000  
Loss from sale of trade receivables 1,426,000 1,059,000  
Goodwill 620,503,000 615,682,000  
Risk cover by third party, minimum (up to) 250,000    
Loss limit covered under self-insurance $ 250,000    
Maximum matching contribution for eligible employees 50.00%    
Matching contribution for eligible employees, percentage 6.00%    
Maximum employee contribution percentage (up to) 8.00%    
Percentage of employer required contribution 100.00%    
Defined contribution plan costs $ 2,222,000 2,101,000 $ 2,084,000
Shipping and handling costs 39,205,000 36,283,000 35,795,000
Research and development costs $ 2,216,000 2,277,000 $ 1,833,000
Dividend yield (as a percent) 0.00%    
Property and equipment, net of accumulated depreciation of $98,674 ($74,713 - 2016) $ 153,143,000 $ 119,428,000  
Deferred Profit Sharing Plan      
Summary Of Significant Accounting Policies [Line Items]      
Minimum required contribution $ 0